Trey Parker, left, and Matt Stone, right, (with Marc Shaiman) in dresses and on acid at the Academy Awards in 2000. (Damian Dovarganes/AP)

The two men hinted at being under the influence of something this March on the “Late Show with David Letterman.” The pair said they were “Sheening” their heads off when they donned the Jennifer Lopez- and Gwyneth Paltrow-inspired looks. (“Sheening” is a reference to actor Charlie Sheen, who has allegedly been known to indulge in illegal substances from time to time.)

This led some to believe the two men had taken cocaine. The “Book of Mormon” masterminds set the record straight to Jimmy Kimmel on Thursday: They weren’t on cocaine. They were on acid

Watch the two explain how this decision came about below.