Who knew you could make so many different weapons with clothespins? Turns out, if you have three clothespins and some rubber bands lying around, you already have everything you need to make a mini crossbow.
You'll also want some matches for the (potentially flammable) ammo, of course—though, as CrazyRussianHacker says, you'll have to be careful if you decide to set this thing on fire. Safety first!
Mini Clothespin Crossbow [CrazyRussianHacker]