That reminds me of this very morning, when Fox and Friends had Andrea Bocelli on as a singing guest.
Just as the segment was ending, Doocy had a brain fart and stuck out his hand to shake goodbye.
My husband is blind and it happens all of the time. He usually will feel the motion of the other person's hand and immediately sticks his hand out. If he has misjudged, the the other person usually will respond with his hand.