Is it just me or is season four of mlp rather dark? And I don't just mean the lighting... Also violence, they had to up the rating for Power Ponies alone.
Implied violent death of a close mentor
The whole castle interior was creepy, but this organ music knocked it up a notch. Although the creepiest bit was the hall of disembodied pony hooves.
The fact that they talked about Scootaloo's obvious disability and her insecurity was a dark topic to touch on, but I'm glad they did.
You won't like Fluttershy when she's angry... I seriously can't believe they went there...
Flutterbat. 'nuff said.
Bonus Castlemania dark bit; when Fluttershy's fully convinced her much loved pet has been killed/crushed by a giant rock pillar:
I left Daring Don't and Rarity Takes Manehatten out on purpose, there wasn't any really "dark" bits. Lots of feels though.