If we're going to get into songs, I nominate the following:
-Sting - Every Breath You Take
I think this one is so notorious I don't need to say any more - except to note that Sting appears to be as horrified as I am by the number of people who use this one as their first dance at their wedding!
-Whitney Houston - Saving All My Love
She's having an affair with a married man. This is romantic, how?
-Brother Beyond - The Harder I Try
Anyone who wants to "make you love me" ought to be told to take a long walk off a short pier
-Various people - Better The Devil You Know *
So it's better to be with a lying cheating scumbag than it is to be single? Thanks; I'll stick with microwave dinners for one!
And those are just the top four on my list of "Songs That Should Certainly Never Get Played At A Wedding Reception"
* I can think of two versions of this song and I don't think either of them are the originators!