As if a giant ape weren't enough to get Jack Black going in "King Kong," the actor says he let loose one time while making the film.

"I had a bit of a lost weekend while we were doing 'King Kong,'" Black says in the January issue of GQ magazine. "Overall I'm very responsible on set. I'm not one of those dudes who come drunk to the set.

"But there was a lost weekend where I had a little time off and I did some Ecstasy and I went on a kind of crazy rampage and I started smoking [again]," he says. "Me and another member of the cast, who will remain nameless, just running around, dancing around, drinking and Ecstasizing, smoking like a chimney. And then it was over."

The 36-year-old actor says he's since quit smoking and is on a strict diet. In "King Kong," he plays Carl Denham, a filmmaker who traps Kong and brings him to New York.

Black's other films include "The School of Rock," "High Fidelity" and "Shallow Hal."