NBA's Rondae Hollis-Jefferson Freaks the Hell Out on CN Tower's Glass Floor!

Wanna see a grown-ass man freak out on video?! Great!

Here's Toronto Raptors star Rondae Hollis-Jefferson TRYING to prove his toughness by walking on the famous glass floor at CN Towers in Toronto ... and IT DOES NOT GO WELL!

FYI, the glass floor at CN Tower (one of the tallest buildings in the world) is a major tourist attraction -- 1,112 feet above ground and people come from all over to stand on the glass and stare down! It's wild!

Rondae gave it a shot ... but when it came time to step on the glass, his fear of heights kicked in and the 25-year-old FREAKED OUT!!

The 6'6" star refused to walk on the glass -- instead he tried to crawl and scoot across ... and it's funny as hell!

For the record, ZERO people have died on the glass floors -- and building officials claim it's so strong, it could hold the weight of 35 MOOSE!!! So, chill Rondae.