Little Johnny is walking down the street smoking a cigar
A man stops him and says "young man, how old are you?"
Little Johnny responds "6 years old"
The man, aghast, tells little johnny "that is far too young to be smoking; when did you pick up that vile habit!?!?"
Little Johnny furrows his brow for a moment, "Sometime after I got laid the first time."
The man, floored by the response, asks "How old were you when you got laid the for the first time, little boy?!?!?"
Little Johnny says "How the fugg would I know, I was drunk"