Sex Pistols in San Antonio, first US tour, the one where all of the "cowboy faggots" showered 'em with beer cans.
The Birthday Party's first US tour, terrorizing lame-ass "new wave" fans on the east coast.
The Replacements gig in Portland where they shaved their eyebrows, swapped clothes and instruments with the opening band, and drunkenly rumbled through a shambolic set of songs, most of which never got played to the end. Only Mats Oregon gig I ever missed, one bad enough to get a song written about it, "Portland (We're Sorry!). My roommate said it was really, really bad, but slightly amusing nonetheless.
Any Joy Division and Triffids gigs.