Matt Stone and Trey Parker are on tonight's episode of Late Show with David Letterman to promote their new Broadway musical, The Book of Mormon (it's in previews until March 24).

But since it's the day after the Academy Awards, Letterman just had to remind them about the time they were nominated for Best Song at the Oscars for their South Park movie, and their decision to wear infamous outfits previously worn at awards ceremonies by Jennifer Lopez and Gwyneth Paltrow. Turns out they have a timely defense. They were on drugs, and those drugs were Charlie Sheen!

Roll the clip:


Related: Get info on The Book of Mormon, now on Broadway.