What's up with the Pony obsession?

[NintendoPie]

spurgeonryan said:

If I was, I would have stopped it, because Bronies are good people. I was not good enough to stop the horror that you unleashed, so that is proof that i do not watch it. Don't even know what channel it is on, but I will guess Cartoon Network. Saturdays.

Is it even on a TV Channel? I've never seen it...

That also makes no sense. What "horror" have I unleashed?