Lady in Red by Chris De Burgh .... I declare it completely rotten.
But when we speak of the truly dreadful, "Cowboy Star" has got to be in the top 5.
The "harden my heart" lady lives in my town. Every year on july 4th there's a big fireworks display in the main park and she plays at it. Every. Single. Year. That song has destroyed a holiday that I wasn't a huge fan of to begin with.