Our friends don't always know us as well as they think, particularly when it comes to likes and dislikes. Which popular book, movie, band, food, TV show, etc. would your friends be surprised to hear that you don't like?
Though I'm a Batman fan otherwise, the Dark Knight movie didn't impress me. I thought it was a really well-made movie, and I can understand how other people love it (and I will occasionally talk about the things I did like about it), but to me the ultimate Batman movie is Batman Returns, with Catwoman and Penguin and the penguins with bombs strapped to them and all the silliness contained in that movie. I just don't like the 'realistic' depictions of superhero movies nowadays. It's a comic book movie, throw in some comic-logic!