In many cases, a movie’s soundtrack is just another piece of its marketing campaign. But occasionally, a song from a film actually becomes more popular than the film itself. Here are eight you can probably sing from memory (whether you want to admit it or not), from movies you’ve probably never heard of. Consider this a spoiler alert - if you read the name of a film and don’t want the plot described, just skip to the next one.

(NOTE: For a song to qualify, it has to have originally been released as part of a soundtrack. And I decided to stick to movies from the 60’s onward. Otherwise, this list might be all Gershwin and Porter.)

Let’s count ‘em down…

So I just watched Abel Ferrara’s trash classic Ms. 45. (Thank you, Netflix.) Sweet crap on a crutch, what a movie. Note that I don’t put an adjective between “a” and “movie”: not “what a disturbing” movie, not “what a fricking awesome movie,” not “what a confused movie” or “what a sexist movie”… although it is manifestly all of these things. Further spoilerriffic analysis after the jump, plus two soundtrack clips that are SO worth hearing, even if you have to close your eyes and click randomly around the spoiler-laden text until you come across the link.