I'm surprised nobody has mentioned McDaniels, who alienated the fanbase before coaching a single game.
I'd say that Plaxico Burress is probably the biggest idiot of the offseason...although, technically, he didn't shoot himself in the offseason. Too bad this happened, because the Bills could have used another guy that knew how to shoot himself in the foot...or thigh, as it might be.
On the other hand, Michael Crabtree is up there. What he is doing is just completely stupid.
Favre is annoying, but he ain't stupid. Anyone that grabs $12.5 million sitting there for him isn't stupid. He's indecisive, wishy-washy, and a drama queen, but he isn't stupid.
Brandon Marshall isn't stupid either. He might get a huge pay raise to put him with the big boys wallets now, and who can blame him for being upset by the madness McDaniels brought to Denver so far? Sure, some of it was Cutler's fault, but not all. Marshall is somewhat of a thug according to his record, but that's beside the point. He's a great player and deserves more on that level.