Most either Crash or 300.
Yes, THAT 300, the one everyone keeps quoting.
I do not care at all how "ridiculous" or "fun" it was meant to be, nobody honestly has fun watching a bad movie. The characters were all psychotic thugs who's insanity was played completely straight and heroic. They were not remotely interesting, likable, relate able or even fun, and the fight scenes were unbelievably dull, what with all that bullshit CGI-trickery. It was just people no-one cares about floating round on a magic cushion of slowmo and special effects.
To put it simply, I have a serious issue with that whole "BUT ITS FUN" excuse people use on bad movies.
But yeah, I pick my worst movies because I believe a poor movie getting lots of money and praise makes it worse. It's like the difference between an angry jock dickhead and an annoying nerd in the corner, at least the nerd has underdog status and isn't loved by all for being a prick.