For one, Scott Pilgrim Versus the World. Definitely a great movie, based on a great comic.
If we're going for classics (although I'm fairly sure this wouldn't count as a proper classic) then Stargate is also a great one. (I'm talking the original movie here - although, pretty much everything with "Stargate" on it is amazing... Even SGU wasn't a *total* disappointment.)
Yes, I am a nerd. A huge one. I've learned to stop denying it and just be proud of the fact that I can make obscure fantasy references AND maintain a healthy social life. /likeaboss.