I don't recall seeing this in gym class... June 2, 2010

I really have to flip a coin on this as to whether or not the kid knows - On the one hand, it's pretty dang clear what this looks like. On the other hand, at that age, I would have said "Here's how you make a towel horn HAHAHAHA PENIS PENIS PENIS".  

And if Dad doesn't know, then he's a crotchless vat-grown synth-father.