Crosses 
Two Nuns
No serious joke (and there's yet another oxymoron) site about the English language could be complete without a collection of puns. Here's one of them.
It's about the Christian Cross, with a pun on 'cross'. (Never mind about why the chicken crossed the road: A better question: Why did the priest cross the road? Answer)
Two nuns driving in their car stop at a red light. Just then a gang of young hooligans come running across the street and jump on their car bonnet, bang on the windscreen and twist off the aerial.
"Sister, sister, what should we do?" said the first nun, all in a panic.
"Just show them your cross." calmly replied the other.
So the first nun rolls down the window and shouts "Gerrof me car ya 'orrible little tykes!"
