The place I used to play paintball at had a very unique setup on an old subaru 4wd sedan. coming out the top of the car through the sunroof was the gunner. On the roof was mounted a tripod with a pipe in the center.

What they did from here was even more interesting. They took a semi-automatic paintball gun, took a boat ratcheting crank and applied it to the trigger to make a 'fully automatic' hand crank semi-auto paintball gun. They applied a small metal rod to the bottom of the gun, fixed it in the tripod, and thus had a fully automatic vehicle they'd throw around the field occassionally. Nifty stuff and interesting premise.
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