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Mouse on a Trampoline 

The act of stretching one's scrotal skin and bouncing the penis repeatedly on it for a large audience, preferably unsuspecting churchgoers...or an elementary school.
The sermon was interrupted when a man stood and entertained the congregation for hours with his mouse on a trampoline.

bald headed mouse on a trampoline 

stretching one's scrotum forward and shaking it up and down so that the tip of the penis bounces on it
hey stuart, did you ever see a bald headed mouse on a trampoline?