And runs downstairs to the kitchen and says "Dad, it's my birthday, guess how old I am!"
The father says "hmmm... Are you 10?!"
Timmy says "yes!"
His dad says "that's great son! Hey, why don't you go tell your grandpa in the living room."
Timmy goes in the living room and says "grandpa, today's my birthday, guess how old I am!"
The grandpa reaches in Timmy's underwear, feels around for a good minute, pulls his hand out, smells it, and says "you're 10!"
Timmy, amazed, says "how could you tell?!"
His grandpa says "I heard your dad in the kitchen."
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