I'll restrict my list to the 5 worst movies I've seen
in the cinema (and I've probably blocked a few from memory that should make this list):
5. Goal!
4. The Haunting
3. Primeval (WHAT THE [censored]!?!)
2. 2 Fast 2 Furious
1. (Easily) Signs
(Maddox review sums it up so well)
Of all crappy movies I've seen on TV and managed to sit out entirely the one that comes to mind most as being utterly horrible is "Mortal Kombat".