Back in 2000, South Park creators Matt Stone and Trey Parker bewildered people when they showed up at the Academy Awards, after their song "Blame Canada" was nominated for an Oscar, in dresses copied from ones previously worn to the event by Jennifer Lopez and Gwyneth Paltrow.

Stone and Parker made an obscure joke about the episode last March on The Letterman Show, but the producers wouldn't let them say "acid," leading many people to believe they implying they had been on coke. But now they've come clean to ABC's Jimmy Kimmel, explaining "It's really important we set the record straight. We were on acid."

"We thought of it, sort of, the week before," they explained. "And then the day came and we’re just, like, so nervous. We’re like, 'No no no there’s no way,' you know? And it was, like, 'We’re not really gonna wear these dresses.' We had tuxes as a backup because we thought we were gonna chicken out. And we did. And we were like, 'Let’s not do that. Let’s not do that.' But then we were like, 'Let’s take a little bit of the acid and see what happens.' So we did that and of course like an hour later we were like, 'We gotta wear the dresses!'"

(h/t Mediaite)

This video is from Jimmy Kimmel Live and was posted to YouTube on September 29, 2011.