What caused you to become a brony? Specifically:
What is the first pony-related thing you remember seeing?
What caused you to watch the show for the first time?
What were your thoughts while you were watching your first episode?
For me, I know I saw some pony-related stuff before it, but the first thing remember seeing was either a ponified version of a character from my favorite Final Fantasy game, or a web page I searched up to see who "Derpy" was.
Then not much later I joined a fairly small forum community where many of the members had ponies as their profile pic or in their signature. After that I was like "hmm, there must be something good about this show that makes so many people like it." So I looked it up at Know Your Meme and read about it there.
After that I searched down a video of the first episode, and with an open mind I hit play (although I made sure nobody else was watching me ). At the beginning where they're telling the story of Celestia and Luna I actually was thinking "wow, this is actually kind of awesome!" Then I watched till the end of the episode and immediately hit the Next Episode button. I then realized how quick I was to go to the next episode and shook my head, slightly embarrassed at myself. However I don't regret it, and soon I just downloaded all the episodes to my computer to watch them. This was all a couple weeks before the end of season 2.
So after that I've been hooked on the show ever since! What about you guys?