Little lad comes home from school. He's in a terrible state - blood everywhere, shirt ripped, buttons torn off.
His mother takes one look at him and asks - "whatever happened to you?"
"I fell out with Jim."
"But Jim's your best pal."
"I know but we fell out, and as we'd been learning about duels, I challenged him to one - and one of the rules is that whoever accepts the challenge gets the choice of weapons."
His mother looked at the state of him and said "whatever did he choose?"
"His sister."