Last two days, I've had "Wild Heart of the Young" and "You Needed Me" stuck in my head.
And while its not currently stuck in my head, today I was randomly singing a little of "You Can't Rollerskate in a Buffalo Herd" at work, and got it stuck in somebody's head. I didn't even expect him to know that song, but he started complaining that the song would be in his head all day. I tried to get it out of his head by singing a few other songs, in hopes of replacing it with a different song in his head. No known luck.