You have your i-Pod/i-Tunes on shuffle, you're jamming out doing your everyday thing, then BOOM! song switches to a completely irrevelant song and ruins your exuberant mood.
Frank: Man, I was rocking out to "The Chili Peppers" earlier I got in my usual calm, moviated mood then BOOM! ..my wife's "Rocket Summer" starting playing and I just lost all hope..
Bob: Ahh! Frank I'm sorry. Sounds like a iTune buzzkill.