Fear
California punk Fear band decided to do something different on SNL’s 1981 Halloween episode. They enlisted a group of slam dancers (including actor and SNL alum John Belushi, who had gotten the gig for the group) to mosh in front of the stage as they played.
Things got out of hand from there, and by the end of their performance somewhere between $20,000 and $40,000 worth of damage had been done to the set. Fear was never allowed to play the show again.