I think it was a link from another website to the Kaycee Nicole thread. Like other 17k-ers, I had to lurk patiently the the MeFi Nether to become a bona fide MeFite.
In other words, I came for the amateur sleuthing, but stayed for the pancakes.
Look How Far We've Come
I think the first time I ever had a "holy shit" moment with MeFi was back in January 2007, when I clicked on a link to this thread and discovered it was a link to a certain (now rather famous) video that happened to be filmed at the wedding of two of my favorite people in the universe. Thanks to the link from MeFi, and a similar link posted at Fark, the video went viral, which just made the experience for those of us lucky enough to be at the wedding all the more special. At the time of the wedding, I had just started law school and was so overwhelmed that I gained a new appreciation for having friends in my life like these.
But what makes this possibly the best MeFi memory ever is this: When I was reviewing the thread to write this, I came across this comment from the OP, kenneth, who had this to say when in response to my thanks to him for posting it:
Much obliged, Dr. Zira. As a gay man, the only thing gay I thought about it was how much I wanted to do it for the wedding I won't get to have. Sniff.
kenneth, I don't know if you still read MeFi, but if you do, you should know that realizing that there are now six states in which it's legal for you to have your own fantastic wedding just became my favorite Metafilter memory. Sniff.