Stevie Wonder and the Iron

Okay, Funny Guy, you're clearly not the sharpest tool in the shed, so let me break it down. You see, Stevie Wonder is a famous musician who is blind. The 'joke' plays on this by saying he'd scream if he were to use an iron. Because he can't see, see? Get it? It's a bit insensitive, but that's the humor style here, my friend.