The comments below also have what I think is the best explanation of the Brony phenomenon I've seen so far:
That was cool and funny but can someone awnser me this.). WHAT IS WITH PEOPLE AND MY LITTLE PONY FRIEND SHIP OS MAGIC????????¿?Strebiskunk
@justintvinhd It's a gradual progression from, "Hey, My Little Pony is actually watchable now!" to seeing that it's actually a really decent show with a number of episodes that are sneak-up-on-you surprisingly brilliant, then starting to really care about the characters, then finding the whole thing is way more fun when you get in on the fan community. I watched about half of the first season before I was officially "hooked."