Seen some fucking crazy suggestions on here.
Blair witch - not as scary as made out, but not shite at all, an original idea during a time of big budget waste of time films, cleverly shot and a decent story line, watch the film again and decide if what actually a Blair witch or could it of been something a bit less paranormal, watch the film on a portable DVD player in the woods at 1am and tell me if you are scared are not. Look beyond the obvious at times try and see what the film is trying to say. Yes Blair Witch 2 was piss poor, but it did have a naked red head witch
Napoleon Dynamite - I just want to shoot the person that suggested that this was shit.
Hell Boy - not great but certainly not the worst film ever.
Fight Club - what a class film, explores in inner psyce of the human mind, is cleverly shot and one of Brad Pitts best roles and for me one of his first break away roles from playing the goody goody face of the movie. Ed Norton was simply class in that film.
Mars Attacks was a giggle
Worst Films are for me
Gigli
Battlefield Earth
are the two that come to mind