The absolute worst: Afternoon Delight by The Starlight Vocal Band.
 Ouch. Hard to decide which is worse: This one, or Seasons in the Sun.

Let's see, if given a choice between listening to Seasons in the Sun or sticking bamboo shoots up under my fingernails, I'd choose the bamboo. But only Afternoon Delight would convince me to claw my own eyes out afterwards.

I think we have a winner.
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Tony Fabris