See if you can get this one (hint...it's a little younger than those other ones):It (Betsy) didn't seem that odd to me. There were lots of songs with random girl's names in them. I guess I figured it had something to do with their first/pilot episode where maybe there was a girl named Betsy to which they sang some song putting people down.
Remember when the title songs to the shows told the set up?
Mr. Ed - A horse is a horse of course, of course.
Beverly Hillbillies - Come and listen to a story 'bout a man named Jed
Gilligan's Island - Just sit right back and you'll hear a tale.
Brady Bunch - Here's a story of a man named Brady....
Green Acres - Fresh Air, Times square, etc.
Look at what's happened to me
I can't believe it myself
Suddenly I'm up on top of the world
Shoulda been somebody else...