Another one to add:
"One Song Wonder": The guy who constantly yells for one song no matter what is currently happening on stage (at Breakfast shows, this song is usually Rufus or Phaddy Boom Baddy). Bad enough when it is an original; worse when it is a cover; even worse when it is a bad cover and/or joke; the absolute worst when it is a Phish or Grateful Dead cover. Punishable by death if it is "Freebird".