WWE Superstar CM Punk -- I'm the One Who Knocks ... On Walter White's Door

WWE Superstars CM Punk and Kofi Kingston better tread lightly -- 'cause they invaded Walter White's turf ... and everyone knows Heisenberg doesn't like strangers in his territory.

The two wrestlers were in New Mexico for a live WWE event this weekend -- and during the trip, they found time to take an excursion to the real life house that's used as Walter's pad on "Breaking Bad."

As you can see ... the house is back to looking pristine ... and not in any danger of ... ugh, just watch last night's episode!

You'll get it.