Johnny writes the word on board

One day little Johnny comes in from the playground and writes the word “tool” on the board in a block letter very small.

So the teacher comes in and erases it and looks around the class for a guilty face.

So the next day he does it again but bigger and it’s taking up half of the board.

So she erases it and looks around the class for a guilty face and doesn’t find one.

So finally the third day little Johnny write tool on the board in big block letters covering the wh*le board.

The teacher erases is and says,

“what’s up with this word?”

Little Johnny stands up and says,

“the more you rub it the bigger it gets”