If you like drinking, sci-fi, and/or comedy, you'll love the World's End. The special effects are cool, but the whole continuing the pub crawl despite the fact they figure out an invasion of some sort is happening leads to ,ore & more comedy.
What really surprised me was just how good the fight scenes were. Nick Frost & Simon Pegg do some serious ass kicking (While Pegg tries very, very hard not to spill his beer). Thumbs up.