I have a tendency to have a great hangover after New Years Eve, lasting for a couple of days. I also have a tendency, when I have a hangover, to have a terrible blood thirst. It's almost only the day-after-the-night-before that I can watch less respectable, new films by my own free will. Having a hangover, feeling sorry for myself and watching people getting their limbs torn off in the most wicked ways possible - it just completes me.
That's why I decided to watch Saw (2004) and Saw II (2005).
Now, they are definitively not as brilliant as the film posters themselves are, but they are entertaining. I will sum up my late-night Saw experience with one sentence: The first one had a better continuity in the story and Cary Elwes from The Princess Bride (1987), but the second one had a much better twist towards the end, but also some very annoying testosterone-high male characters.
There, I won't waste more words on those films, although they weren't bad. (Just wait until I watch the rest of them, hu-ha...) If that wasn't enough, you just need to watch Angry Alien's 30 second re-enactment with bunnies [click on picture below] - it pretty much sums up the whole series, I believe.