Riki-Oh: The Story of Ricky

Adapted from a Japanese manga and set in a privatised near-future prison, this is the one where a superhuman inmate punches so hard that heads pop, jaws detach, and one warlord tries to strangle him with his own unspooled intestines. Lam Nai-choi plays the escalating carnage with a completely straight face, and that straight face is the whole joke, since the gore runs so far past plausible that gravity itself seems to have quit. Louis Fan is the impossibly noble hero, flexing his stomach muscles to stop a knife. It is the friendliest, funniest film on the Cat III shelf, assuming your idea of friendly runs to a man fed through a meat grinder.