Today my End key won't work, and neither will my Page Up or Page Down keys, but the rest of the keyboard works fine. Could anyone tell me why they suddenly conked out?

Well, Rapunzel, it's highly technical. Ya see, usually this sort of thing happens on the Ides of March, but if ya check yer computer's clock, I think you'll find that you've got it set a little bit ahead. Just wait around until about this same time tomorrow, and it should clear itself right up! Provided the correct offerings and sacrifices at the Oracle, of course.