A blind man once asked for help to cross the road. Another man came to his aid. However, before assisting him, he waved his hand for about half a minute in front of the blind man's face.

The blind man wasn't blind from birth, though. His eyes were carved out while he was in prison. He has been out of prison for four years now. He has a good job and has been clean ever since.
And everyone knows his eyes were carved out.