Once when you tell it once when you tell her the punchline and once when she gets it.
Nah-imma-stay
It's my tummy, and I feed it NOW!
Both are a play on words.
You're scaring my wife. She's only 12, jeez.
You'd think it'd be the punchline, but apparently it's funnier when the person feints...
The way that the punchline of the joke is delivered.
Tell her a joke on a Monday!
Three times - Once when you tell it, once when you explain it, and once when she gets it.