I have several, but whenever someone mentions guilty pleasures, Event Horizon is one of the first ones that pop into my head. While no masterpiece the film is incredibly well shot and made an impression on me when I was younger. And it's a lot of fun in a certain kind of way.
I just rewatched Fired Up! Last night. Also far from a masterpiece even as far as teen comedies go, this one just has the perfect tone and sarcasm for me.