My cat had a very complex "wake human up so he can feed me" system. First of, he would wail in front of my bedroom door. Oh, the wailing, it was horrible. "MOOOOOWWWWW, MOWWWWWWWWW", and so on. If I didn't bother with it, he'd run from one end of the hallway to the other and back again, with that stomping sound that only cats manage when they're angry. If the combined efforts of wailing and stomping didn't work, he'd open my bedroom door (a feat he learned very quickly) and wail next to my bed.
If all of these didn't work, he'd attack my feet.