Iron Man
I only went to this movie because all my friends were seeing it. My recent experiences with superhero movies like Spider-Man 3 had soured be a bit on the genre and I was never interested in the Iron Man character, but well, you've probably seen this movie and there's nothing more I need to say here.
Call of Duty 4: Modern Warfare
I was never into CoD at all. I was working video game retail as the CoD craze was just starting to boom (2008-2009) and I decided to give the most recent CoD (which at the time was World at War) a spin. I really didn't see what all the fuss was about and ignored the series altogether after that.
Then I made some new friends who told me how much better Infinity Ward was at crafting compelling campaigns. Then I discovered Zero Punctuation and saw how even a hater like Yahtzee extolled the virtues of CoD4's campaign. So I decided to give CoD4 a shot and am I ever glad I did. It actually turned out to be one of my favorite video game stories and one of the stand-out experiences of the 7th-gen. It's a shame that none of the successors have lived up. Yes, I did give MW2's campaign a shot and as soon as Russia INVADED THE EASTERN SEABOARD OF THE U.S. I recognized the campaign for the ridiculous pile of wank that it was. I haven't given CoD the time of day since. (Yes, I know that most who play CoD are multiplayer-focused gamers; I am not one of those people.)
Warm Bodies
My wife really wanted to see this movie, but I thought that it looked really dumb. I saw it as an obvious move to try and capture some of the Twilight audience, I was burned out on the zombie genre (and still am, really) and the trailers portrayed the movie as having a certain "Shaun of the Dead" zombie movie parody approach that is REALLY not my cup of tea.
After my wife gave up on getting me to watch it with her, she decided to rent it herself and watch it on her own. I happened to be in the living room, using the coffee table to go through CCG stuff, and I ended up really getting into the movie and enjoying it.
I was right that it tries to cash-in on the Twilight fans, but only from a marketing standpoint. In terms of the feel and atmosphere of the story, it really has a lot more in common with Beauty and the Beast. Also unlike Twilight, the acting from the leads is legitimately good (for the record, I think Robert Pattinson is actually a legitimately good actor, he's just horrible in Twilight) and Teresa Palmer is much more appealing than Kristen Stewart. Also, to re-visit the dead horse for another kick, Palmer's character is a genuine, independent, and strong female character, unlike Bella who (you should already know everything I could say here).
The trailers grossly misrepresented the movie, taking a one-shot, hokey "pretend to be a zombie" gag and highlighting it as if those sort of gags would be a big part of the movie.
And as for the whole "I'm sick of zombies" thing, the movie was compelling enough as a genuine love story for me to transcend that, which further speaks to its quality.