Daniel Hale's (David Hale's younger brother, now deceased) interactions with Hyung Soong, which silenced new york, and had literally everyone in the system participating in the unfolding events. All completely improvised, and yet forming a coherent narrative.
The day I joined the RoS, about 12 days after I washed up here...
The first time I made a major difference in a fight, taking out an LABC with some other random RoS nub named Thor.
Some of the Eta events between the RoS/101st/TBH/Benitez were incredibly awesome. They taught me to fly... Eventually.
The day a few of us went keepering and ended up going on a sirius wide tour with some trader who just seemed to get it. The RP was epic, as was running from the BAF.
There have been plenty of other moments as well... Some truly awesome stuff has happened over the time I've been here...