Plenty of people are familiar with “The Aristocrats.” Known as the dirtiest joke ever told, it’s been modified and repeated by the likes of Penn Jillette, Eddie Izzard, Lisa Lampanelli, and Bruce Vilanch. Fewer people, however, are familiar with Dennis Regan, the cleanest comedian to ever grace David Letterman’s stage. Unfortunately for Regan there’s a limited cable audience for jokes about the Three Stooges trashing Payless shoes that refrain from referencing foot fetishes or the F-bomb. Regan is so clean, in fact, that his booking agency rates him as “suitable for family or conservative groups. No strong language and little or no sexual dialogue or situations.” But don’t let the Disneyesque rating fool you—Regan proves there’s a middle ground between overly sarcastic situational comedy and the shock humor of newcomers like Dane Cook and Carlos Mencia. His suburban-dad routines are reminiscent of Bill Cosby’s early–’90s standup, if Bill Cosby had fast-food experience. Perhaps the best thing about Regan is that you’ll never come across a joke of his that you can’t forward to your Baptist sister-in-law.

REGAN PERFORMS AT 8:30 P.M. AT THE DC IMPROV, 1140 CONNECTICUT AVE. NW. $15. (202) 296-7008.