My last would be OBGyn-I'm glad some people like it, but I just have no desire to view the female anatomy over and over and over again, punctuated by views of the female anatomy covered in slimy, smelly blood and fluid, ripping apart as the baby comes out, with the mother screaming in agony.
Peds is getting a bad rap here, though! I guess as a parent I'm a little more understanding of the parent's side-I've never had any problems with them. I love the peds attendings I've worked with, and I'll probably do some sort of academics, either a subspecialty where there are no ear infections, or research, where I can do clinic a couple afternoons a week and not go crazy.
And finally-yes, it is painful to take care of a sick kid, but it would be more painful to let someone else do it (or no-one). And there is nothing like saving a child-you save a 70 year old-it is great-but if they don't start smoking and eating at Mickey Ds again, they might live another 10 or so years. If you save a child, you have given them an entire lifetime, and you have saved their parents from the horror of losing a child.