This terrific sketch show from the Crying Diamonds blends creative physical comedy with risky political and religious humor and bright, idiosyncratic vignettes on romance. The central recurring characters are two geeky lovebirds whose history is told from end to beginning, Memento-style, throughout the show. Other, unrelated sketches include a rap about communism, a caveman musing on the conclave choosing a new spiritual leader, and a press conference in which Osama bin Laden announces that he's cured cancer. The seven ensemble members make a good team, and director Piero Procaccini ensures that even the transitions between scenes are funny. But the sharpest bits are definitely those that involve physical comedy, like scenes of stop-action fighting, a kung fu battle in which "invisible" players lift the combatants into the air for slo-mo, and a boy and girl meeting cute over bad behavior at a football game. Through 5/7: Sat 10:30 PM. Second City Training Center, Donny's Skybox Studio, Piper's Alley, 1608 N. Wells (fourth floor), 312-337-3992 or 877-778-4707. $5-$10.