I smiled like the smug jackass I am at all the stupidity throughout the movie; the pointless slow-mo, the pointless sex scene, the pointless supporting characters, the acting, the fact that the 713's highly-trained "agents" were fighting demons dressed in riot helmets and those fake chest suits you get from the Halloween supply store to make your abs and pecs look huge (even the women were wearing them... ha!). I just smiled, though. I made it through the entire movie without laughing.
That is, until the Nightwish song kicked in. And then I just fucking lost it. I must have howled for twenty goddamned minutes, and I've been singing that song for people all day.