...why I would have "Livin' on a Prayer" stuck in my head?
I dislike it.
I am inclined to blame nyczoo; she's often responsible for this kind of thing. But I don't think it's her fault this time.
You know what is her fault? That I know about, and therefore must share with everyone, this:
People who have ever been to summer camp may find this familiar. Then again, if they went to that one place I love, they may not, as that may be the only camp I've been to that doesn't do that song.