cb4 is a 1993 american comedy film directed by tamra davis and starring chris rock. the film follows a fictional rap group named "cb4", named after the prison block in which the group was allegedly formed (cell block 4). the movie primarily parodies the rap group n.w.a among other gangsta rap aspects, as well as taking inspiration from "this is spinal tap". it contains short segments featuring celebrities and musicians such as halle berry, eazy-e, butthole surfers, ice-t, ice cube, flavor flav, and shaquille o'neal.