Were going to skip the usual hes a big man who gets big laughs tag line that most people use to describe Lavell Crawford. Lets just say, hell never make a living doing Jenny Craig commercials, so its a good thing hes funny as hell and doesnt need to. 8 and 10:30 p.m. today and tomorrow, 7:30 p.m. Sunday. Improv, 7620 Katy Freeway. For information, call 713-333-8800 or visit www.improvhouston.com. $20.