I have to go with Something Clever's passive moron. What I like most about it is thinking about how the SB must have thought he was so clever on every street. It must have gone something like this.

Flop: Sweet! I'm going to c/c this on the flop and screw everyone on the turn with a c/r.

Turn: Well, no one bet on the flop, but I'm sure that someone has to bet now if I check. It's still going to be super sweet when I c/r all these donks.

River: Oops! Someone has to bet now. I can still c/r all of these suckers and show them how good and tricky I am and that will be sweet.

Showdown: Well that definitely F***ing sucked! You guys all play so bad. You guys are so weak passive. Don't any of you guys know how to bet?