Anything on this list- http://www.doctornerdlove.com/2011/10/four-lies-movies-taught-us-about-dating/all/1/
I especially liked the bit about "Sure you're in a tree outside her bedroom window, but it's only so you can watch her sleep!"
Actually, pretty much every vampire "romantic gesture" I can think of creeps me out. I'm not sure it's because they're all extra creepy compared to non-supernatural idiocies, or if the added element of "Dead people are hot!" puts them over the top.
The worst example I can think of is from the sixth season of Buffy The Vampire Slayer. The scene where Spike attacks Buffy in her bathroom and essentially tries to rape her. The writers apparently thought that would come off as more romantically desperate than, you know, rape-y. If I recall correctly, the woman running the show at that point said it was based on a moment in her own life when she tried to force herself onto a guy to keep him from leaving her. Putting aside the fact that it's an incredibly ill-advised and despicable thing for a woman to do to a man, there's also the fact that it's especially
creepy if you turn it around and make it a man doing it to a woman. Like it or not, our culture treats male on female violence differently than it treats female on male violence, and to throw a sexual element in on top of that? And still somehow think your audience will be okay with it? Not very bright.
Of course, there were some people who saw it as oh so romantic, as intended. That just goes to show you the usual sort of things this sort of situation goes to show you.