I also decided to teach my wife to play poker. And I told her about the tells, this is a type of involuntary body and face movements to understand that a person is lying, anxious, etc. And she, my smart, in a few nights after the game bought a chip that when I lie, pupils "shoot" down and return to the place. It lasts a fraction of a second, I do it involuntarily and once, I cannot control it. Since then, I can’t lie to my wife in anything, looking in the eyes, and playing poker in mirror glasses.