(Proverbs 23:2 KJV) And put a knife to thy throat, if thou be a man given to appetite.
I have wanted to develop this habit. There are certain people that are always trying to con me into something. One way involves food. That works for me because I am at best a borderline glutton. I keep thinking that because someone has baked a cake or ordered something lavish at a restaurant I am on their good side. It is not to be.
My goal is to identify those people and find some symbolic way to remind myself that I am not to be at ease. At a meal it might be to literally pick up a knife and casually tap myself on the throat. At a party maybe I could find a door and tap it with my head.
So? Just as all that glitters is not gold, neither is all that smiles a friend.