Broadway baby John Mulaney is fresh off a highly successful run as cantankerous sex pest George St. Geegland in the bizarre stage show Too Much Tuna. Prior to treading the boards, Mulaney worked as a stand-up comic and writer on Saturday Night Live. His stand-up is powered by his near-obsessive layering of detail into strange-but-true stories, which include tales about his childhood and his dog and playing insidious pranks with a diner's jukebox. Mulaney is back on the road with his new comedy tour, Kid Gorgeous. He performs at 7 and 10 p.m. Thursday, October 19, at Peabody Opera House (1400 Market Street; www.peabodyoperahouse.com). Tickets are $22 to $32.