Ok, probably not much of a spoiler, but if you haven't seen Serenity yet, you might not want to look at the bottom of this mosaic, and I swear by my flowery bonnet you don't want to click on it.
But then again, you might not have got your copy of the DVD yet, or you might not have enough time to watch the whole thing before lunch.
I give you every second of Serenity, all at once:
ETA: I worked around the bug that was limiting me to 90 minutes. The FULL movie is now at http://www.lecompte.org/Dave/Mosaic/Serenity/serFull.png