I was actually surprised to hear "Shiny Happy People" by R.E.M in the opening of "Marley and Me"; I instantly sang along to it.
Same with hearing "One Love" by Bob Marley (but hey, that's how he got his name).
Oh, and I also forgot to mention, a couple days ago I watched "Volcano" for the first time (it was an okay disaster movie; I've seen better, though), and I was surprised to hear Randy Newman's "I Love L.A" in the end credits (I played air guitar and sang along). But, like most disaster movies which seem to take place in either L.A or NYC, it made sense since that's where the movie took place.
Coincidentally, there was also a shot of "Newman's Donuts" in the opening like in the music video for that song.