One day Little Johnny saw his grandpa smoking a cigar. Johnny said, "Can I have a puff?"
Grandpa said, "Can your dick touch your ass?"
Johnny said, "No, then that's your answer."
Later that day, Johnny saw his grandpa drinking a drink. Johnny said, "Can I have a sip?"
Grandpa said the same thing, "Can your dick touch your ass?"
Johnny said, "No, then that's your answer."
Later that night, Johnny was eating some cookies in the kitchen. Grandpa said, "Hi son, can I have a cookie?"
Johnny said, "Can your dick touch your ass?"
Grandpa said, "Yes."
Johnny said, "Good, go fuck yourself!"