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 start swearing.

We are getting old enough to do that!"
The 4 year old nods his head in approval.
"When we go downstairs for breakfast I'm gonna say 'hell', and you say
'ass' ok?"

"Ok." the 4 year old agrees with enthusiasm.

Downstairs they go:  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 ass it
won't be Cheerios!"