My first episode was "party of one". I just read Cupcakes (well, I saw the Gmod version on YouTube) and it said that it was based off "party of one" or something, so I watched it, saw more episodes, and I started to like it. I only properly became a brony when I heard they were making a pony Tumblr, so I made a pony blog, soon quitting Tumblr due to haters hating me, and now I'm here.
I have actually only been a brony for 4 months now. Also, I got to "Cupcakes" from some funny Gmod videos on YouTube.