Viagra for Diarrhea

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

The first pupil said: 'Crocin'

'Very good! And what is it used for?'

'It is used for headache.'

The second pupil said: “Calmpose'

'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 loose motions.'

'Who told you this?'

'Nobody, but every evening my mother tells my father, 'Take a Viagra, maybe that little shit will get harder.'