As soon as you sit for lunch the emergency room will want you. As soon as you "finally" sit down to take a break a patient will need a breathing treatment. As soon as you click on the Internet they will call. Yes it's true: they only call when you don't want them to.
This brings us to RT Cave rule #48:
RT cave #48: If you want someone to page you they won't. If you're in a room and the patient won't shut up, and you can't think of a way to escape, your pager won't go off. It's just the way it is