A nursery 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 sometimes be gray, or black."
A second little boy says, "Trees are definitely green."

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

Then little 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 DEFINITELY shit my pants!"