First little girl says "The sky is definitely blue"

Teacher says, "Sorry, Amy, but the sky can be grey, or orange..."

Second little boy..."Trees are definitely green"

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

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 have DEFINITELY shit in my pants..."