From memory here are some examples:
(1) Jarvis Cocker dropping his pants during Michael Jacksons melodramatic performance of Earth song at some award ceremony (2)KLF firing machine gun blanks in to the audience at 92 Brit awards and dumping a dead sheep at the aftershow party (3) That Sex Pistols performance on a boat outside parliament (4) Keith Moon...nuff said (5) Ozzy Osbourne ditto (6) The Happy Mondays exploits in Barbados (7) Stone Roses performance on the late show (8) The entire Factory experiment (9) Morrisseys quotes in the press during the 80's (10)New Order refusing to mime on top of the pops
I am sure there must be loads more, any examples?