The F-Bomb

I was babysitting my aunty's 9 years old son and her 8 y.o. nephew last weekend.

The three of us were playing Wii Sports -bowling to be exact- when I accidentally knocked one of my fingers. The sharp intense pain made me uttered - silently and very casually - "Ow, fuck!"

Opps...

Both of the boys immediately stopped and looked at me innocently.

"What did you said?" one asked
"Nothing."
"Did you said the F word?" asked the other
"No."
"I heard that too!" the other agreed
"No."
"You did said the F word"
"No."
"You sure?"
"No. I mean, yes. Look, you guys didn't hear anything ok? OK????"
"Ok..." (continued bowling)

Children, so naive.