P
There's a little boy at school and asks the teacher if he can go to the
toilet.
"Okay" says the teacher. "But first you've got to say the alphabet."
They boy says the alphabet:
"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."
"What happened to the 'p'?" asked the teacher.
"It's running down my leg, Miss."