After sex ed every year in middle school (my school system taught it every year, grades 5-12, no permission slips, health class required)
, all the boys would start a dare game. At any given point in the days, one of the boys would whisper 'penis'. The next guy had to say it louder, then next louder, until there where five or six guys in the middle of math class screaming "PENIS!!" at the top of their lungs. It would last a few minutes, but it never hurt anybody, just disrupted class, so they never got in any trouble. They even had most of the teachers laughing.
<SIZE size="175">PENIS!! :biggrin:</SIZE>