Sometimes I awake with the strangest songs in my head. I'll be standing in the shower and find myself singing something like "My Bologna" by Weird Al Yankovic. One might think that the original --"My Sharona" -- by The Knack would be the song that would get stuck in my brain, rather than the parody. There's something about the line "I always eat too much and throw up" that causes it to pop into my mind at the oddest times.
When I say to my wife, "guess what song I have in my head?" she has learned to say, "No, no! Don't tell me. I don't want it stuck in my head!"