Joke

The lady teacher asks the pupils what kind of Medicines they know and what they are used for.

The first pupil said: "Tylenol". . "Very good! And what is it used for?".
"Is used for headache."

The second pupil said: "Nytol". "Excellent. And what it is used for?".
"To help you sleep."

Now it is Johnny's turn and he said: "Viagra".
"Johnny, what is it used for?''. "I think it can be used for diarrhea".
''Who told you this?'' "Nobody, but every evening Aunt Susan tells Uncle Sam,'Take a Viagra, maybe that little shit will get harder."