I am never on call. I made it a condition of employment. Been there, done that, got the t-shirt a long time ago. My work is highly specialized, so I do get called occasionally when an issue is very complicated or a DBA is stuck trying to figure something out. By occasionally I mean a couple of times a year. We have a very proficient technical staff where I work, and there are firm controls in place to prevent "accidental code" from assaulting production.