I thought the world was fucking with me. Apparently I was wrong.
We may know one, but nobody knows one who'll admit to it in public.
A lot of bronies were little boys who wanted a toy with brushable hair that would be acceptable to uptight parents.
I work with some. I work at an internationally known IT company, and I was sitting in the break room one day, and there across the room was this table of really geeky folk with a My Little Pony stuffed animal standing in the middle of the table. It was about a foot tall. This was one week after I heard about what Bronies were, so I thought it was a magical coincidence.