Can a movie be enjoyably confusing? “Identity” (2003) is a cross between a Friday the 13th movie and a whodunit, since we have cops and ex-cops and people with mysterious pasts doing the whole film noir thing right in the middle of them getting killed one by one, which I guess makes it a “who’s doing it” instead of a whodunit. A whodoit? There’s also a subplot with a mass-murderer dude who is facing the electric chair and you’re trying to figure out if the whodoit part is a flashback, or a flash forward, or some other kind of flash.