One time, going to a local anime con (not the weird part), I had to run to 7-11 to grab something or other. I ran into my uncle (he's actually younger than me as my grandpa remarried when I was 3 or 4 but is college age) in a pony shirt. He was like, "Going to the brony meetup, yeah!" I had no idea he was into ponies before that. xD So was his younger sister, but that's a lot less surprising! She had tons when she was a kid.