If I'm understanding the op correctly, we can share either questionable/gross (in the eyes of others) things we do when no one is looking, or the things we do when no one is watching that others may only do when they stand the chance of receiving a beam of approval from someone else. I've got plenty of the former, but I'm going to buck the trend and report one of the latter as well: I always pick up pennies I find on the street. The only reason I wouldn't would be if it was embedded in a chunk of dog shit or some other distasteful variety of curb flotsam. It's a symbolic gesture, for me, of my determination to live simply and frugally, and an acknowledgement (two second meditation?) that to some people in some parts of the world, a penny is a lot of money.