Weird Science - where else could you see Anthony Michael Hall at his best, and Ilan Mitchell-Smith's best roll ever. Of course, the movie was good for two reasons - Kelly LeBrock. Gurrr Rowl!
A recent release full of the cheese factor is Idiocracy, directed by Mike "OfficeSpace" Judge. Owen Wilson plays a completely average soldier who gets frozen for 500 years and finds he is by far the most intelligent person on Earth - as everyone else has evolved into a complete moron (the President is a pro-wrestler). I got some huge chuckles out of it, and the "dumb level" is remarkably high.