I think that "The Back-Up Plan" is by far the worst movie I've ever seen - in a cinema...xD
There are a number of books, websites etc. devoted to this subject. Start with Medved's 50 Worst Movies of All Time and The Golden Turkey Awards. Then check out Incredibly Strange Movies from ReSearch.
IMHO, the greatest bad movie of all time is Phil Tucker's Robot Monster -- a must see. And any afficianado of bad movies should seek out a screening of Tommy Wisseau's The Room. This has a cult audience and shows regularly in real theaters in larger cities. People go see it multiple times, speak some of the dialog, throw things at the screen at certain moments. The film itself is bad in an inexplicably bizarre and entertaining way.
I too love bad movies...recently I watched 18 Year Old Virgin and loved it. The lead actress is HOT
i hate movie fountain :S
I think I remember seeing a really stupid one. I think it was called stuck on you. Maybe you heard of it?
In case no one has said this yet, I recommend the entire "_____ Movie" series, with the exception of the first Scary Movie, as being the worst of the worst. Also, there was a film a few years back called Orgazmo about a Mormon who becomes a porn star. I know it sounds funny, but don't waste your time.
There isn't half some crap being made lately, I mean i thought it would be difficult to stoop to the lows of scooby doo but quite i few are managing it lately
distric9 2009 is bad