Songs in Your Head

There is a bit of a game I like play at work on occasion, called, put a song in my co-worker's head. I walk around casually singing a line of a song and wait to hear other people singing it later, and feel so amused at my power. But, today, the game is on me. I have a song stuck in my head, an Amy Grant Christmas carol, that my co-worker, DAvid put there INTENTIONALLY by singing one line repeatedly from his office. So, I tried to use my countermeasure of singing "It's Howdy Doody Time" over and over, but so far, Amy Grant is winning. (And, yes, I do get my work done, eventually :)