These guys at the extrems of the bench have nothing to do by being honest or not. “Keep Them Honest” is a poker expresion meaning: “To call at the end of a hand to prevent someone from bluffing.”
There are so many expression that it took me a while finding one that would fit this photo.
This is a bench, formed by poker cards. (yes, I know that is obvious, but still had to make my point!🙂 )