At any time, get on the internet and go to any website. Go on YouTube, Google, Tumblr, Facebook, whatever. Immediately or eventually, you will stumble upon many things related to My Little Pony: Friendship is Magic. Click any link it gives you.
You will immediately (or over nine-thousand years from then depending on the quality of your internet connection) be taken to one of the many breeding grounds for the worst people you will ever meet: bronies. No matter what you do, you will be dragged into a conversation with one of the bronies.
The brony will begin sharing with you his experiences as a brony, who he believes is the best pony, how he became a brony and why you should become one of them.
As soon as the brony begins to discuss why you should join him and his insane friends, you must simply and clearly say these words: "Sorry, but I am not interested in your fandom." After saying this, log off immediately and watch, play, read or listen to something without a mentally-troubled fanbase. After doing this, you must not return to the site until at least a week has passed or else the brony will catch up with you and pick up where he left off.
If you fail to cut off the brony at the right moment, he will persuade you to watch an episode of MLP. One will turn into two, two will turn into three, three will turn into rewatching the entire series fifteen times over again, you will buy endless amounts of merchandise, your computer files will be filled with ponies and you will have officially become one of them.
If you do as I instructed, you will gain the ability to tell good fanbases from shit ones.
That, my friend, is when you become one of us...
A Homestuck.