Realitycrash said:
The original Planet of the Apes had a huge one, you know, back before everyone knew it.
Can I just take this moment to give the original Planet of the Apes a shout out. People have treated that film so poorly with daft sequels, and that god awful Tim Burton film, that I saw ages before the original, and thus, dismissed the series as a bit naff. Then, one boring day, I saw the original was on and, with nothing better to do, watched it. My God, it's absolutely amazing. The twist is amazing, and beautifully done (even if I'd seen it parodied and the like many a time before, so knew exactly how the film would end), and everything else about the film is just as awesome. I implore anyone reading this, who may have ignored it, to give it a chance. Classic sci fi at its finest. . .
Now I've got that gushing gibberish out of the way, I'll go on to my pick of film with an awesome twist. Lucky Number Slevin. The first half of the film is a light hearted romp of mistaken identity, and then the twist drops, and damn, it completely changes the film, and blows my mind. Absolutely awesome. Seriously, you need to see this film.
(also, someone already said Memento, but it's one of my favourite films ever, so yeah, Memento).