What champion do you most hate having on your team in a ranked game?

We always talk about champions we hate to play against, so I thought it would be interesting to discuss who we hate playing with. For me, it's Teemo. I have noticed that, in my Bronze 1 games, Teemos are almost always completely useless. It's getting to the point where I audibly groan if I see my top laner pick him. I'm curious to hear everyone else's opinion in different elos, though.