[classicman]

A 7 year old and a 4 year old are upstairs in their bedroom.

You know what?, "says the 7 year old, "I think it's about time we started swearing."
The 4 year old nods his head in approval.
"When we go downstairs for breakfast I'm gonna say 'hell' and you say 'ass', O.K.?"
"O.K." the 4 year old agrees with enthusiasm.

The mother walks into the kitchen and asks the 7 year old what he wants for breakfast.
"Aw, hell Mom, I guess I'll have some Cheerios." WHACK!!
He flew out of his chair, tumbled across the kitchen floor, got up and ran upstairs crying his eyes out.

She looked at the 4 year old and asked with a stern voice, "And what do YOU want for breakfast, young man?"
"I don't know," he blubbers, "but you can bet your sweet ass it won't be Cheerios."