My favorites have pretty much all been mentioned already. '80s movies are interesting because there are some really goofy comedies that seem to have universal appeal and good production values, unlike the goofy comedies of today (Wedding Crashers, etc., which I hate).

Better Off Dead (John Cusack is great)
Say Anything
Evil Dead II
Blue Velvet
Stand By Me
The Blues Brothers
Back to the Future
Time Bandits
The Adventures of Baron Munchausen