"Killer Clowns from Outer Space" was supposed to be funny I think, but I just found it kinda bad. Don't think I saw Judi Brown's EGAE. Y'know, "Baron Von Munchausen" was more or less science fiction, in the vein of Jules Verne.
I agree about Killer Clowns. I didn't see what the fascination was.
While we're thinking about Baron von Munchausen, honorable mention (at least in my book) to Time Bandits (somewhere treading the ground between sf and fantasy, but I liked it!)
My dad loved Tremors, but I thought it was kind of stupid, but a lot more fun than Killer Clowns. too...a lot of bad horror stories are told in an sf motif....
And then there was My Science Experiment....