A 5 year old and a 4 year old are upstairs in their bedroom. "You know what?" says the 5 year old, "I think it's about time we start swearing."
The 4 year old nods his head in approval.
The 5 year old continues, "When we go downstairs for breakfast I'm gonna say 'hell,' and you say 'ass', OK?" The 4 year old agrees with enthusiasm.
The mother walks into the kitchen and asks the 5 year old what he wants for breakfast. "Aw hell Mom, I guess I'll have some Cheerios."
Whack! He flies out of his chair, tumbles across the kitchen floor, gets up, and runs upstairs crying his eyes out.
The Mom looks at the 4 year old and asks 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."