My big one though is This Is Spinal Tap. People keep raving about it, but I remember watching it and never once even cracking a smile. Dull, dull, dull! One of the few dvd's that I've sold.
I fell asleep while watching this movie.

I actually agree with most of the comments in this thread, except for the one about The Breakfast Club. That movie rocks all over town, IMO. By far my favorite 'coming of age' flick, and funny as hell. I still can't get through a single episode of The Dead Zone without thinking about The Breakfast Club and the elephant lamp.