One heck of a hard-hitting ending (SPOILERS)
Spoilers ahead
I just saw this movie for the first time today, and I loved it! Very nail-biting, but I have to say the part that stuck with me the most was the ending. Very tastefully done, with the shots of the people just living their lives with the countdown laid over it, and the flash... very well-done and very shocking.
The end, the "this could never happen..." disclaimer was great too. Very ironic.