The Grateful Dead's First Annual Pyramid Prank

"There were no sets. Sometimes we'd get up and play for ten minutes and all freak out and split. We'd just do it however it would happen. It wasn't a gig, it was the Acid Tests where anything was OK. Thousands of people, man, all helplessly stoned, all finding themselves in a roomful of other thousands of people, none of whom any of them were afraid of. It was magic, far out, beautiful magic."
– Jerry Garcia, quoted in Garage Sale – Ken Kesey, Viking/Compass 1973.