There seems to be an unwritten rule that movies starring ex-stand-up comedians must come to a grinding halt at some point for the star to have a vanity improv scene.

Every Robin Williams has such moments -- even his syrupy, sentimental pictures. Every Martin Lawrence movie does too. In "Blue Streak," the improv moment comes when Lawrence dons a nappy pigtails wig, gnarly false teeth, body padding and a velour jogging suit to pose as a hyperactive pizza delivery boy.

For that one scene, any common sense regarding the story is put on pause and Lawrence cuts loose with an epileptic booty bump dance and a lot of babbling smack, all of which is designed to produce seat-bouncing laughs (it doesn't), but has little to do with the movie.

Continue reading: Blue Streak Review