A pre-school teacher says to her class, "Who can use the word "definitely" in a sentence?"

First a little girl says, "The sky is definitely blue."

The teacher says, "Sorry, Amy, but the sky can also be grey or orange."

Then a little boy says, "Trees are definitely green."

"Sorry, but in the autumn the trees are brown."

Johnny from the back of the class stands up and asks, "Does a fart have lumps?"

The teacher looks horrified and says, "Johnny! Of course not!"

"OK. Then I have definitely shit my pants."