I just watched TWO completely unrelated pieces of media, which both incorporated a certain song. And in each piece, characters used the song as a sort of camaraderie test: if you knew the lyrics, you were of an age, and could be friends. A sort of communal open-secret guilty pleasure, if you will.
What were the pieces of media?
1. The Proposal, starring Sandra Bullock and Ryan Reynolds -- which, though predictable in structure and plot (cause really, I mean helloooo) was actually, in its dedicated snarkiness, quite hilariously delightful!
2. Episode 21 ("Mamma Mia") of Season Three of 30 Rock
What was the song? If you haven't guessed from the post title, perhaps you fail the test? See below. (I think for my contemporaries I might have picked "Ice Ice Baby" . . . thoughts?)