Joke stolen from: Chucklebuns

A young boy came home from school with a bloody nose, black eye, and torn clothing. It was obvious he'd been in a bad fight and lost. - While his mom was patching him up, she asked him what had happened. "Well, Mom," he said, "I challenged Henry to a duel. And I gave him his choice of weapons." " Well," said his mother, "that seems quite fair." "I know, but I never thought he'd choose his big sister!"