I've seen this thread come and go for a while, and various songs came to mind, but I couldn't quite pin it down to THE 'worstest' of my worst list. Having just been watching 'You've Got Mail' on TV tonight and the wonderful scene in it when the little girl sings for her doting family, it is confirmed that top of my worst list has to be "The Sun'll Come Out Tomorrow" from Annie. It's maybe not so much the song itself as the way it always lends itself to being sung by every child I have ever heard singing it. The scene in this film (and the girl actress deliberately (?) singing badly, captures it perfectly !

Oh... and I'll second the vote for Barney, too.

- jeanie