Luke speculates: Where do we get these things from anyway, like these body language gestures and so on? I'm going to make up some nonsense in response to that question. Are you ready? Here we go. We're Luke just speculates about something he doesn't know about. And then maybe checks it to verify. The back of your hand is not necessarily the best place if you're fist bumping or bowing. It's a bit better than the handshake, but it's not perfect,. Because you're still making contact and it is with the back of the hand. If you need to wipe something off your face, don't do it with your fingers, the underside of