The moment Dave Chappelle was attacked on stage in front of thousands of fans was crazy as hell ... so says former NFL star Marcellus Wiley who tells TMZ Sports he was in the building for the whole thing!!
We spoke with the star of FS1's "Speak For Yourself" ... who wasn't the only celeb in attendance, and he told us the scary incident unfolded right in front of his own eyes.
"Yea, I was in the building man, and it was crazy to be there," Wiley said.