i know
a gutter pipe cut in half lengthways
a crossbow bow and some tough string on it
a 100 shot pod attatched to it permanently
a stoppy thing somewhere near the end of the gutter pipe which don't get in tha way of the paintballs! then........
when the string is released and the pot goes up the guter pipe full uv paintballs it hits the incy wincy stoppy thing and stops really quickly and then the paintballs are catapulted outta tha pot and into.... well .....the air and all over people.