Dead/Alive and Army of Darkness.
WK covered my entire list with the first movie he mentioned. Big Trouble in Little China is Ace.
Does Time Bandits count? Or is it just one of those "weird 80's movies"?
Snob is the best source for bad films. xD
Oh, how could I forget a series that was at once a tribute to B movies and then became B movies themselves.
Tremors.
I own the boxset of all four films. They are awesome.
Thankskilling. Have a few too many beers and watch that movie and your faith in humanity will seem restored.