A sack of oranges is prominently featured in a scene in The Grifters where Anjelica Huston and a mob boss (who was that guy) menacingly discuss a con involving beating someone with a sack of oranges. Supposedly if done properly, it doesn't hurt, but leaves bruises all over the "victim"; however if done wrong it causes all kinds of internal bleeding, blah, blah, blah you die.

I've always wondered if that was true.