Bronies Take Brooklyn for Ponycon 2015 The male adult fans of "My Little Pony" gather for Ponycon 2015.

 -- "Bronies" are one of the more peculiar and interesting phenomena of this decade. If you're not familiar with the term, they're adult male fans of the children's toy and eponymous TV show, "My Little Pony."

The My Little Pony toys have been around since the early 1980s but didn't catch on with men on a wider scale until the release of the 2010 animated series "My Little Pony: Friendship Is Magic."

While "Friendship Is Magic" is every bit the children's series it intended to be, the writing is deceptively sophisticated and adult humor is subtly woven through the series without the younger audience knowing, according to Bronies.

Those inside jokes, along with high-quality animation, has created a fan base that rivals Trekkies in their passion and knowledge.

To see the phenomenon for ourselves, ABC News visited Ponycon, a My Little Pony convention in Brooklyn. It was a mix of My Little Pony fans, young and old, where fans dressed in costume and shared three days of friendship, magic and harmony.