Calling maniacs (there's one in just about every game) with far less than a premium hand, but it must be better than this guys hand ... then thinking he must be bluffing when the continuation bet comes, so calling the flop (or getting called when I make a continuation bet) ... and then having to fold to the obvious turn bet, because well, he's a maniac.

In general:
- Lack of patience
- Trying to play table sheriff without the goods
- No clue how to play post-flop. Still a big leak of mine.