There are no marquee names among the cast of Cabaret Dada -- at least, not yet -- but these are the bravest, most inventive comics in Cleveland. The job requires it. In a purely improvisational format, the audience shouts out the silliest, most perverse scenarios it can conceive. Cast members might depict a narcoleptic Elvis Presley playing croquet against a nymphomaniac Janet Reno. As incongruous as the sketch elements are, the actors invariably tie them together to hilarious effect. And if you suspect that some audience members are plants, go to a show and yell out suggestions of your own. Cabaret Dada is funny, and it's real.