Tonight Show

Jimmy Fallon tried on Madison Bumgarner's underwear on live TV last night ... and it was hilarious.

The World Series hero appeared on "The Tonight Show" -- armed with a gift for the talk show host ... a pair of the "Mad Bum" undies that Jockey started making in Bumgarner's honor.

FYI -- the undies have quickly become collector's items ... since Jockey only made 2,000 pairs to commemorate the pitcher's historic World Series performance.

Fallon was pumped about his new drawers ... and tried 'em on right on the set.

Wiz Khalifa's great defense for blowing off court in Texas Wednesday -- he was hanging out with Megan Fox and Jimmy Fallon on "The Tonight Show."

Sure, Wiz could've kept a low profile -- since there's a warrant out for his arrest -- but instead he popped up as a guest on Fallon's show.

As we reported ... Wiz was supposed to be in court in El Paso Wednesday for his pot bust in May ... but when he didn't show, the judge issued the warrant.

Wiz's next hearing might go something like this: "Your honor. Pictionary. With Megan Fox?!!"

Jonah Hill got seriously choked up while making his second public apology for blurting out a homophobic slur at a photographer -- and called himself a role model ... for what NOT to do.

Hill was on "The Tonight Show" when he brought up the video we posted Tuesday -- Jonah yelling to the photog, "Suck my d***, you f*****."

Hill was emotional about using a word he calls "grotesque."

Legendary comedian David Brenner has died at the age of 78 ... and he went out with a joke.

Brenner's rep says David passed away peacefully Saturday evening at his NYC home surrounded by family.

As we previously reported ... Brenner slipped into a coma this week after his cancer got aggressive and started spreading rapidly.

D.B. holds the record for most "Tonight Show" appearances with 158 couch sessions. He also hosted the show a handful of times.

We're told David had one final request -- $100 in small bills be placed in his sock -- and said it was "just in case tipping is recommended where I'm going."

David Brenner -- who holds the record for number of appearances on the "Tonight Show" with Johnny Carson -- is on his death bed and people close to him say it's just a matter of days.

Sources close to Brenner say the 78-year-old comedian has cancer that has been aggressive ... spreading rapidly.

We're told Brenner slipped into a coma this week ... and doctors don't expect him to pull through.

David sat on Carson's couch 158 times ... and even hosted the "Tonight Show" a few times.

He was also a frequent guest on Howard Stern's radio show.

The person who has a copy of the Johnny Carson sex tape now wants to sell it ... but potential buyers have to blindly cough up a fortune just for the chance to see it.

The attorney repping the guy who has the tape tells TMZ ... his client will hold viewing parties for people interested in buying the 70's home video showing long-dong Carson banging one of his wives.

Now get this -- in order to even see the tape ... prospective buyers must make a blind bid. The seller is not setting a price. He'll just review what's on the table.

And it gets even crazier. To qualify to see the tape, prospective buyers must show they're serious by depositing their bids into an escrow account. And, like Carson's schlong, only huge offerings will make the cut.

After the screening, prospective buyers will be invited to up the ante.

And one more string attached. The winning bidder must sign a document saying it cannot be sold commercially -- it's solely for a private collection. And, if the buyer violates that ... he or she will get socked with a huge financial penalty.

Unlike the rest of the universe, Joan Rivers isn't all that curious about seeing how big Johnny Carson's penis really is in that sex tape -- because she says ... she's already seen it up close and personal.

Joan -- who guest hosted on Carson's "Tonight Show" for years -- said she and Carson had a "one night bounce" back in the day ... and he was hung like a horse.

It'll take more than Johnny Carson's 10-inch kielbasa to get a rise out of Dave Chappelle -- but only because DC's a legend when it comes to exposing junk on TV.

Dude got Snoop Dogg and Q-Tip to collabo with singing STDs! God, we miss Chappelle.

Add Dave Chappelle to the list of people in awe of Johnny Carson's sex tape ... especially after we broke it down -- inch by inch -- for him last night.

Dave was actually in total disbelief when we told him about Carson's videotaped sex romp outside DBA nightclub in West Hollywood.

But you gotta see his face and hear his reaction when we tell him just how #blessed Carson was -- 10 inches by some reports.

Call him a c*** show host ... TMZ has learned, Johnny Carson recorded a sex tape with his wife back in the 1970s -- and not only has the tape just hit the market ... very solid sources tell TMZ, Johnny's johnny is ENORMOUS.

Multiple sources tell us, the tape owner approached the Carson estate in September to make a deal for the footage -- the estate said take a hike, and threatened to sue the owner if he ever sold it.

But the owner's apparently gone rogue -- we're told he's now shopping it to private collectors ... and it is legendary.

According to sources who've seen it, the tape appears to be one of his wives -- it's unclear which one. The tape opens with a naked dark-haired Carson masturbating by a pool -- then shows the woman (with a bouffant hairdo) going all Linda Lovelace.

It goes on for about 5 minutes -- then we're told it cuts to a 20-minute sex scene in Johnny's bedroom ... and Johnny does NOT hold back.

Oh yeah, we're also told he's hung like a horse -- seriously, porn star status. One source said it was at least 10 inches. But for legal reasons it can't go to a porn company, so the only way to unload it is with a private collector.

Lindsay Lohan wasn't spewing BS on "Jimmy Fallon" Thursday night -- talking about a "Mean Girls" reunion -- TMZ has learned, it's been in the works for weeks.

FYI, 2014 is the 10th anniversary of the film's release -- and sources tell us, co-writer Tina Fey has been leading the charge for a reunion to commemorate the occasion ... wrangling the entire cast over the last month.

And Lindsay was apparently the last to know about it -- she went on "Fallon" Thursday talking about how she had just run into Tina who mentioned the reunion idea to her ... and Lindsay was into it.

It's unclear how the reunion will come together -- Jimmy suggested hosting it on his show -- but we're told it could also materialize as a comedy sketch ... maybe on an awards show.

Sources close to Tina tell us, several prominent cast members are already on board -- Amy Poehler (Mrs. George), Jonathan Bennett (dreamy Aaron), Rajiv Surendra (Math Enthusiast / Bad-Ass MC), and Daniel Franzese (Too Gay to Function).

Pretty awesome. Now get in losers. We're going shopping.

Jimmy Fallon's crushing his competition -- partially because NBC's making one helluva deal for celebs to come on his show, and stay off all the other networks.

It's the kind of hard bargaining ... expert negotiators can appreciate.

NBC is coming down like a hammer on celebs who want to get on Jimmy Fallon's show ... if they dare do a show on CBS or ABC ... they can forget about "The Tonight Show."

Sources connected to CBS, NBC and ABC tell TMZ ... the Peacock network believes Jimmy Fallon's ratings success gives them extreme bargaining power. They put the word out to celebs, agents and publicists ... if they want to be on Fallon they can't appear on ANY other network ... and not just shows that go head-to-head with Jimmy, but morning shows as well.

We're told NBC is saying the stars who go on Fallon are also allowed to appear on "Today," "Dateline" and any similar shows they air, but that's it.

A GMA source tells TMZ ... they've already gotten fallout from people they were trying to book.

Fallon is dominating late night .... crushing Jimmy Kimmel by bringing in more than twice the number of viewers.

Don't expect Jay Leno to hijack "The Tonight Show" back from Jimmy Fallon ... because the ex late-night host swears he's done with TV ... FOREVER.

Jay was in West Palm Beach Florida -- but not to start his retirement. Leno was there to perform stand-up comedy just two days after his exit from "The Tonight Show."

Jay's answer may come as a surprise ... especially since he left the show in 2010 ... then famously wrangled it back from Conan O'Brien.

Joan Rivers thinks Jimmy Fallon is the perfect replacement for Jay Leno for one key reason -- he's actually funny!!!

Rivers unloaded a barrage of Leno insults on our photog yesterday in New York City, while heaping praise on Fallon ... who she says she's been trading emails with since news of the "Tonight Show" switch broke.

Rivers' beef with Leno and the "Tonight Show" has been going on for over 20 years ... which coincidentally is the amount of time Rivers says Leno has been on the air ... and done nothing memorable.

Jay Leno will be beached when his contract is up ... but not a day before -- this according to sources connected to NBC.

Jimmy Fallon will be replacing Jay on "The Tonight Show" when Jay's contract is up in September, 2014. There's been a buzz that NBC may not want to wait and will make the change before Jay's contract expires. Not gonna happen.

Informed sources connected with the network tell TMZ ... when Jay renegotiated his contract during the Conan O'Brien mess, he demanded and got several penalty clauses that would make NBC take an ENORMOUS financial hit if they pull the plug early.

We do not know specifically how much of a penalty NBC would have to pay, but we're told Jay made it so big, it would be too much for NBC to swallow.