overheard in my house recently

f.: mommy, i know a great game that we can play with the boys.
me: ok, what is it called?
f.: jock itch
me: jock itch?!
f.: yes, mommy, jock itch
me (swallowing fits of giggles): umm, ok, where did you learn to play that?
f.: i am the only person in the world who knows how to play it.
f.: i invented it!
me: ok, how do we play?
f.: well, first we take some of those legos and we build towers, the first one whose tower gets knocked over is out.
me: ok, so how do you win?
f.: you have to be the one with the last tower standing!