"Where's The P?" joke
One day Johnny was sitting in class and had to go to the bathroom so he raised his hand to ask the teachers permission. The teacher told Johnny if he could say the alphabet he could go to the bathroom. Johnny stumbled through it and got it all wrong and had to hold it. So Johnny studied and studied and felt as though he knew the alphabet perfectly. The next day when Johnny had to use the bathroom he rose his hand to ask the teacher could he go. The teacher said if you can say the alphabet I'll let you go. So Johnny started to say the alphabet ABCDEFGHIJKLMNOQRSTUVWXYZ. The teacher then asked Johnny well where's the P, and Johnny responded it's running down my leg.
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