heres a joke

there was a little girl,who was in class,and asked her teacher if she could use the restroom."sure.first sing the alphebet."the teacher said."ok"said the little girl."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"she finished saying the alphebet.wheres the p?the teacher asked."running down my leg"the girl said