Johnny Knows What It Is

There is a teacher teaching sex education to a bunch of 5th graders. She walks to the chalk board and draws a huge penis on the board!
She truns to the class and simply asked the class, "Class, does anyone knows what that is?"

The class sits silently for a second or two than little johnny stands from the back!
He yells, "I know what that is! It's a PENIS! I know cause my dad's got two!"
"He uses the small one to pee and the big one to brush the teeth of babysitters!"