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 just shit my pants!"