I cannot STAND it when folks call into work and then ask me if I think Big Boss Lady will be mad about it.
Seriously, folks, if you have a justifiable reason for not being able to be at work, it shouldn't matter if the boss is cranky about it. There are only two reasons I can think of that would cause you worry over calling in. 1) You just started working at a particular place and have called in more than you have been there; or 2) You don't really have a valid reason for calling in and are worried about getting caught.
Think about it, people.