It's unusual for anyone in Hollywood to admit to using drugs, unless they are about to go to rehab, but doing so on Hollywood's biggest night while wearing dresses worn by Jennifer Lopez and Gwyneth Paltrow earn South Park creators Trey Parker and Matt Stone first place on our list.

Back in 2000, when Parker was nominated for Best Song, he and Stone shocked audiences and red carpet attendees alike by showing up in copies of dresses worn the year before.

What possessed them to do this? 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!'”