Recently:
Meet the Spartans.
In my life: Lots.
Waterworld and The Postman.
The Quick & the Dead.
Most modern spoof movies like Dracula: Dead and loving it, Scary Movie and others. The spoofs are rarely as funny as the original.
House of the Dead. Street Fighter. Super Mario Brothers.
The Hulk. Ghost Rider. Ultraviolet. Bloodrayne. Aeon Flux. Daredevil. Some more comic book and other pop culture movies I have moved out of my brain.
Most of the recent National Lampoon movies. Dorm Daze was somewhat funny. All the others are crap.
Any movie where Ben Stiller, Jack Black or Will Ferrel are the main characters.
As supporting actors they all rock, (Keeping the Faith, High Fidelity, Drowning Mona) but they are NOT comic geniuses and are seriously overrated.
And this whole concept of making movies that are deliberately bad just irritates me. They arent funny. They're stupid. Will Ferrel is probably the biggest offender with Step Brothers, Blades Of Glory, Talladega Nights, Bewitched, Anchorman, Elf, and many more.
EDIT:
In reference to the above conversation: Trainspotting is on IMDB's top 250 list, which just blows my mind. I'll admit it was amusing but doesnt deserve to be on any TOP lists.