Tim Paul was a little apprehensive about stripping down in Skinprov, one of two saucy Saturday-night improv shows at the Annoyance Theatre in Uptown. So he decided to get some practice. “I started going to underwear parties and taking my shirt off at bars,” he says. Annoyance founder Mick Napier is known to do the same thing at nearby SoFo bar—perhaps not coincidentally, as Skinprov is hisbrainchild. The show immediately follows the improvised Late Night Tit-Bits, which centers on a burlesque club and features lovely ladies dancing in their skivvies. But the male-dominated Skinprov is a lot more—how do you say?—bare. To start the scene, the audience picks a location—which, even if it’s a meat locker, quickly gets too hot—and the cast members take off their shirts en masse. By the show’s end, the dudes are running around in just their jock straps. “It’s usually not acceptable to take clothes off in [improv] shows,” Paul says. But exposing a little skin keeps the night loose and free. “We had a guy sit in the front row one week with his shirt off,” Paul recalls. “I wish more people did that.” Check out the goods at the Annoyance Theatre Saturday 20.