launching the flame war:

If it was written intentionally to be comedic, its not daft, its funny.
If it was written for children, its not daft, its silly.

A daft song is ridiculous when you think about it, but takes itself seriously.

So my orignial nominees were:

Stand By Your Man
Spirit in the Sky
Total Eclipse of the Heart

but I have to agree agree that MacArthur Park takes the cake.