The bronies I know seem to know, but I tend to stick to smaller sub-communities anyway.

Didn't know that with the 3rd gen. Always interesting how much has been carried forward from previous generations!
I squee'd and said "you already are!" when Rarity said she wanted to be a crystal pony hehe~

Yeah I know I've seen the "look into this and you'll see your worst fear" concept somewhere before. I'd look on Tropes, but I'd be clicking around it for the next 12 hours haha.