It's something that spoils you the story/movie/episode/book/etc. For example if you go and see the plot for a book,and then go read the book it wont be that interesting cause you already read the plot of it. It kinda depends on people types. Sometimes when I miss an episode,I go find the plot, and the episode after that is still interesting. I guess it depends on all the stuff :/ Next time if you have a question on what something means,just type the weird word in Google and it will find tonn of meanings to the word. Usually the unknown words are part of Internet slang, and no one knew all the words of the slang right away. I am a part of the internet for 4 years now,I still know very little about it. I hope this helps!
I missed it. Found the beginning on YouTube. I think it is quite likely the scariest part of the Episode. It's like finding out your mother is fully capable of harnessing the powers of darkness at will, but chooses not to.
I didn't intend to imply that Celestia was anybody's mother. But you have an older figure of power and benevolence that, so far as I can tell, everybody looks up to as the Epitome Of Good In The World. (And when I was a young child, the epitome of good in MY world was my mother.) So you have the Epitome Of Good In The World, beloved by all, and then she abruptly reveals that oh, by the way, she is **fully capable of harnessing the Powers Of Darkness.** The ponies apparently just shrug this off, but I was sort of horrified by it.
Had you seen the spoiler images first? I had, and was pretty damn worried they were going to give Celestia an evil episode. I actually gained quite a bit of relief from that scene because it denied those expectations though agreed, if I could I would've changed that bit in the scene because it wasn't a pretty thing to see. And then Twilight goes and does it later on > >. Whatever drives the plot I suppose...
I'm not sure why I originally asked about the mother thing. Possibly just for clarification or it might've been because I misinterpreted.
"so far as I can tell, everybody looks up to [Celestia] as the Epitome Of Good In The World." I don't think i'd be able to make the case for anyone except the villains in the show not having an extreme level of love and respect for the Princess. I haven't looked to see if there are cases where she is looked on as anything but (other than special scenarios like Twilight going psuedo-paranoid with stress) a great leader however I think it's pretty safe to say you won't likely find any examples.