This guy cannot get a hard-on no matter what he tries.  He goes to his doctor who says it does not look physical.  He sends him to a shrink.

The shink talks with him, and says that he cannot do anything, but he knows a witch-doctor who can help him.

He goes to the Witch-Doctor, who tells him that he will put a spell on him.   All he has to do is say "One Two Three", and he will have an immediate hard on for as long as he wants.   But there are of course a few caveats..

- This will only work once a year
- You get rid of the hard-on by someone saying "One Two Three Four"

The guy is happy about this, thinking to himself that finally he can have sex with his wife.   She is in the bathroom, getting ready for bed, and he says "One, Two, Three", and as promised, his dick gets as hard as it has ever been.   His wife in the bathroom says "What did you say 'One, Two, Three', For?"