What movie is this from?

[OREOSpeedwagon]

My friend is trying to figure this out, we know it's in a movie and a bunch of kids (I think?) start whistling this song...

Text

 

[Steve]

The Breakfast Club.

 

[OREOSpeedwagon]

Wow, awesome, I can't believe I didn't catch that. Thanks

 

[Steve]

http://www.youtube.com/watch?v=cTGxYS3kl4Q