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!
If I remember, the eHell blog covered unfortunate songs used at weddings a time ago. It included such classics as "Send In The Clowns," and "The Lady Is a Tramp." Classy, though a little o/t.
The book posts remind me of a short story I'd really like to find again. Maybe I'll post it on TVTropes You Know That Show. Kind of creepy, but awesome, about a girl who came and visited a family about everyday, I think? All I remember is that she was kind, helpful, and grew sicker looking by the day, and the people she befriended were concerned over her and her never eat salt rule. So they gave her a huge meal of salted ham and she took a zombie like walk back to her house, behind her house, and laid back in her grave and went to sleep! Her mother chastised the people because you never feed salt to the dead...

Also one where a guy bought a dresser or a fancy desk of some sort secondhand, and found a pigeon hole in it. He uncovered a letter written by a girl who owned the dresser formerly, a longing for someone to love. He, for the fun of it, wrote a response letter and put it back in. The next time he looked, he received a response back from the girl, and it culminates into him putting some item in it (a scarf?) and he goes to look up a cemetery with her name. His personal item (scarf?) is found on the grave, with some sappy quote engraved to him.
((These were in a Middle School English book, btw. I quite liked the weirdness of it.))
Back O/T:
I never did like The Notebook. Really. I'm usually willing to suspend my belief in sane rules and logic and hinky meters for the sake of a hokey Rom-Com every once in a while (You've Got Mail and Made of Honor, notably), but even I couldn't watch that one.
I do appreciate 50 First Dates, in a sappy kind of way...