I became a brony when i watched an episode of teens react to my little pony, I thought i would watch an episode just to see what it was because i had never heard of my little pony or bronies before. putting your hoof down was the episode i saw in the recommended section, i watched it, thought it wasn't half bad, i commented saying "wasn't as bad as i thought it would be" someone then replied "well of course, it's ignorance like yours to judge something that you have never seen before"
i then looked on youtube for "funny pony pictures" found a few good slideshows but nothing of interest
about 2 weeks later I discovered people posted pictures on memebase's "my little brony" i had been to the site before but i never noticed the brony section.
a month passed and i discovered there was a fandom, i was too lazy to read so i listened to my little dashie (yes i cried)
then i discovered fimfiction, the first fanfic i read was "Colt of the West" an adventure staring Daring Do and Braeburn
later i met another brony at school, who pulled out a peewee trading card.
but shortly before that i discovered bronies also made videos, like the MLP meets series and the one where rainbowdash reads stories with monkeys in them and boys sound girly and girls sound boy-y
yeah long story short i don't get out much