When little Timmy was about 4 he started following his big brother to school. The teacher was patient and every day sent him home, but the next morning he would always be back. Finally she went to the principals office and asked what to do. The principal said, "give him a test monday and if he passes he can stay and if he fails tell him to go home".
So Monday morning comes and Little Timmy shows up. The teacher tells him the deal and he agrees. The principal comes in to observe. First she asks him "Timmy, how do you spell cow?"
Little Timmy says "c-o-w"
"Very good" says the teacher. "Now, what does a cow have 4 of that I only have 2 of?"
Little Timmy says "legs"
"Alright Timmy, one more question. What do you have in your pants that I don't have in mine?"
Little Timmy says "pockets"
The teacher asks the principal, "what do we do with him?"
The principal shakes his head and says "we have to let him stay, I got the last two questions wrong!"
"Very good