Don't forget to take note of your own earworm before you read on.
I heard Donna Fargo's The Happiest Girl in the Whole USA recently on an episode of Big Love. The original is a very happy, fluffy, country-pop song from 1972. The version on Big Love was sung slowly, almost like a dirge, and it really played up the whole "God" angle of the song. In my opinion, it didn't work.
The original is a much nicer song, and I decided to listen to it last night. Which has resulted in me having it stuck in my head this morning. Now you can too. Check it out: