For me it was immediately after my high school graduation overnighter. It was held in this giant gymnasium/fitness club deal, there was a dance floor, some games, some food, karaoke, and so on(the works). When I was there I didn't have a single proper conversation with anyone. It was sort of humiliating and enlightening, I'd spent four years of my life with these people and couldn't relate to them at all.
There was a girl involved as well, as there always is, but the main point is that I knew then that something had to change if I wanted to get through my life. I couldn't just be content to be a ghost incapable of anything but minor social interaction while I was intellectually alive. I'd rather be dead.
So I remembered I'd seen this place in the past and decided to join, thinking a community of fellow aspies would be easier to relate to/use to make myself a more sociable person like I was when I was much younger.
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What are your stories? They needn't be as necessarily as long as mine, a quote of your first post might be amusing.
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I am autism.