The P

It was a average day in Bobby's first grade class. Around 11:00 he had to go to the bathroom, so he raised his hand and ask the teacher. The teacher noticed this pattern and asked him a question " Bobby, if you want to go to the restroom, you have to recite the A-B-C's" Bobby being a below average student slowly recited "a-b-c-d-e-f-g-h-i-j-k-l-m-n-o-q-r-s-t-u-v-w-x-y-z" The teacher noticed that he was missing a letter so the teacher replied "Umm..Bobby, what happen to the p?" Bobby replied "Oh, I'm sorry Ms.Swanson, but its running down my leg.