I'm working on a caveman fps / rpg / simulator.
in the game, one can attack to subdue, or to kill. similar to attack to subdue in original D&D.
subdued opponents can be captured (if you have a rope).
in the game, you can interact with everything in the environment (like in The SIMs), right down to the last plant, rock, tree, and bush (of significant size). This includes captured prisoners.
So when you capture a hostile caveman, and you walk up to them and select them by hitting the space bar, you get the "Captured caveman" menu:
Kill, then eat
Torture for no reason
and then the "Torture caveman" menu...
Fart in general direction