Recently done a few RPs with a rather interesting concept - thought I'd throw it up as a prompt, see what people do with it.

A Female Stage Magician (who uses real magic sometimes to spice up the usual sleight of hand) has an ancient magical artifact that helps with a particular trick (All the RPs used a box that allowed for ACTUAL sawing in half, while still allowing the lower half to remain alive, and for what happens to one half to affect the other). However, the artifact requires sacrifices to remain 'fueled', so the Magician decides to work the sacrifice into her performances - the RPs I did involved the magician having herself sawn in half, then hung or decapitated by her apprentice/lover/aide, playing the role of a 'random audience volunteer', but you could change it to the magician actually picking a random female member of the audience and snuffing her.

I look forward to seeing how people work with this. :)