i heard it likr this:

there were three guys, shut up, be quiet, and trouble.


they were riding down the road in a truck, and trouble was in the back.

he fell out and noone noticed.

in about 5 minutes, shut up and be quiet were stopped by a police officer.
he says "what's your name son?" "shut up", "and whats your name son", "be quite," "are yall looking for trouble???," "naw, we dropped him off about 5 miles back!"

not very funny