Jerry Garcia's revenge
An acid flashback, especially when the acid was taken at a jam band music festival.
dirtyhippie1: Dude?
dirtyhippie1: You still there, man?
dirtyhippie2: Sorry. I was having Jerry Garcia's revenge.
dirtyhippie1: You still there, man?
dirtyhippie2: Sorry. I was having Jerry Garcia's revenge.