A lot of people think Star Wars is science - fiction. But it is fantasy.

I’ve got one that’s the opposite: Tusk (2014) is listed as a comedy, written and directed by Kevin Smith (of Jay and Silent Bob fame), but is actually a horror film.

Donny Darko, maybe? All I knew was that it was a psycho thriller. I had to go on the internet to find out WTF I had just seen, because it’s also a sci-fi.

Cabin in the Woods, Tucker and Dale vs Evil, and Troll 2

The Princess Bride. The title does not at all suggest that this is a comedy movie.

Stalker by Tarkovsky. The description made it sound like a really cool sci-fi/fantasy, bleak adventure movie. Instead it was just a bunch of melodramatic philosophy. Pretty much nothing even remotely sci-fi happens.