Oh mine huh.
Can I be really cheesy and say, seeing the community evolve over the years. Without you all, Halo wouldn't be the same. From the epic conversations on several forums, the lore debates with some of the most smartest Halo fans I know, seeing the community help those in need, the general banter with everyone, to meeting my real dad in matchmaking(that last one was a joke) ;)
And while we might have some down times, I always know the community will get back up, cause if I know one thing about it, the community is persistent. Lets go for another 15 years everyone.