Walter
There are hundreds of annoying TV character out there, but the Walter character seriously takes the cake for me. I have never hated a TV character as much as I hated this kid, I wanted him to get his ass kicked almost every time they had the actor recite a line. The worst was when Betty had to write a review for that hotel, if my significant other ever acted like that I would have had security called and had him thrown him out.
I'm always dragging that horse around...