So here's how it goes, you take a still from a movie. The first person to guess the still then gets to go next and post their own, and so on.
The best way to take a still is by using the snapshot function in the cross-platform media player VLC (grab it here for OS X and Windows:
http://www.videolan.org/vlc/, it should be available in your distributions repo on Linux) You can then take this still to
http://tinypic.com and upload (make sure you resize the still in tinypic to 640x) You'll then be given a link to post here that already has the IMG tags in place
EDIT: Or even easier search google for the movie and poach a still from there
I'll start with an easy one: