These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: My Little Pony: Friendship Is Magic S4 E3 "Castle Mane-ia"
Crosses the Line Twice: Fluttershy watching a pile of rocks get crushed thinking Angel was in them? Awful. Fluttershy trying to dig Angel out only for Applejack to jump on the pile and start trampling it? Hilarious.
Dude, Not Funny!: Fluttershy thinking that her beloved pet has just been crushed.
That... thing at the end of the episode. Pony of Shadows or not, the implication that some malevolent force is watching and plotting from the sidelines, and the Mane Six are completely unaware of its existence, is plenty unnerving.
Squick: A bee flies into one of Gummy's nostrils and out the other.
Take That, Scrappy!: Angel appearing to get crushed. Yeah, we know the whole time it wasn't him, but it's hard to imagine a similar gag being done with the likes of Gummy or Winona.
Uncanny Valley: The horse statue that scares Spike. The spiders don't help.
The Woobie: Fluttershy, due to her being overly worried of Angel being lost and then apparently to have been crushed by rocks (even though Angel wasn't under those rocks and was with Twilight and Spike the entire time).