One of the best moments at the Comic Con was watching the new Green Lantern, Ryan Reynolds, recite the entire Lantern Corps Oath for one young fan. In front of everyone in Hall H. Here it is on video.
Fast forward a few minutes in, and you can see the moment:
This video is a little shakier but has a glimpse of the fan in his Green Lantern duds and Ryan Reynolds doing the ring motion. Insanely Cool.