hhhmmm....to name a few, I'd probably have to say:
'Attack of the Killer Tomatoes'
The 'Evil Dead' movies and the Chucky movies(even tho they're gross, they are so campy that I love them)
A movie I saw many years ago called 'SSSSSSS' - not sure if it was a made-for-tv movie or an actual screen release
'Snakes on a Plane' (keeping in the same reptilian vein as 'SSSSSSS'
The 'Scary Movie' series...those are too funny!
And a hilarious movie that was released as a horror back in the early 70's called 'Night of the Lepus' about mutant killer bunnies. (Since I'm a rabbit lover I find this one particularly hilarious.)