I think I just stumbled into a Mandela effect situation.
You know the song Walking on Sunshine? It came out in 1985, and then it was in, like, every movie in the 1980s. It's traditionally played when the hero wins at the end. At least, that's how I remember it.
I just looked it up on IMDB, out of curiosity, to see how many films it was in... and according to IMDB, what I remember never happened! I mean, yeah, the IMDB page for Katrina and the Waves is long, and almost entirely full of them performing Walking on Sunshine (they are the ultimate one hit wonder). If you scroll down, though, look at what they were doing in the 1980s. You have a few obscure TV shows, half of them are in spanish, then The Secret of My Success (1987), and Look Who's Talking (1989). Great movies, big blockbusters, but I feel like it was in a lot more than just two films in the 1980s. After that, it got a bit of play here and there, mostly on TV shows (like Beavis & Butthead), until around 2000, when everybody started playing it again, probably out of nostalgia... but was it out of nostalgia for something that actually happened, or were we all too coked up to remember the 1980s clearly?
Maybe IMDB is wrong, I don't know. It's really weird, though.
Known for: Moon, American Psycho, High Fidelity
www.imdb.com