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What MOVIE was the "happy days" theme song in?

Me and my friend were watching the "happy days" theme song on youtube and we bothh had a feeling that it was on some type of movie or something. Maybe a disney movie? We arent sure. It would be awesome if anyone could help us out with the name of the movie. Plz and thank you :)

Public Comments

1. There were 2 theme songs for Happy Days. The first was Rock Around the Clock by Bill Haley & His Comets, which was part of the soundtrack for American Graffiti. Then they made their own which would not have been in any films.
2. "Rock Around the Clock" is most famous for being the first rock 'n' roll song used in a movie. It is played during opening credits of "Blackboard Jungle" and "American Graffiti". Those are the only ones I know about and vividly recall, being a Baby Boomer. But, I don't know if it or the "Happy Days" theme are used elsewhere. I'll look around.
3. Lol Happy Days was a television sitcom in the 1970's. It should still be in syndication somewhere. All about Happy Days: Http://en.wikipedia.org/wiki/Happy_Days As far as I know the theme song was only used for the show. I know it wasn't used in American Graffiti because the theme song for that movie was "Rock around the Clock.
4. american graffiti, blackboard jungle
5. I personally remember first hearing that "rock around the clock" song on Karate Kid Part I or II....they are in some bar dancing or something and that stupid song is playing...maybe you heard it there