My parents', stop crying or I will give you something to cry about, keeps me from being able to handle my 5yo when he's getting emotional or crying about something I see as trivial or is a resolved conflict.
I feel embarrassed when someone, even my wife, sees me cry. I usually break down alone and as quietly as possible to avoid being caught. I'm better at letting that shit go, now, and allow myself to break down in front of my wife, but no one else.