Let someone pretend to get shot in the eye by ricochet? Just a small act, maybe his asshole will tighten up a bit.
Personally, I would probably throw his junk out of the window, but since you want to resolve it calmly...
Originally Posted by Freeze
If he comes back with another one, take it and hide it. Or for each time he shoots you with it, have everyone shoot him back with one.
An eye for an eye, a tooth for a tooth, and 100 shots for every shot fired.
That were my first thoughts, but this can easily turn against them.