What the horse apple's moment

[Dulset Tarn 441]

That's hard to say though if we go by the "Journal of the Two Sisters." IIRC, it took a team of more than three unicorns INCLUDING Starswirl to raise and lower the sun & moon, and it essentially drained their power. In contrast, when Celestia took over the sun duties, she not only did it with little effort, but managed to gain power from it AND gave back the power that the unicorns had lost.

 

So...hard to tell.

But you can't judge a pony's power level by their special talent.

Unless they're Twilight :\

[Tameless 979]

Most shocking..

 

Probably be Season 4 Episode 13, Simple Ways

 

When Rarity wanted to be "like" Applejack to impress her crush.

[Gearbox10mm 794]

For me it was in the episode were Rainbow Dash tried to steal the book from the hospital and it was revealed that the barking dog chasing her was actually an escaped mental patient. That had to be one of the best wtf moments in the entire show. It totally cought me off guard.

[Jangocoolguy 433]

Twilight being dragged to hell at the end of "Canterlot Wedding Part 1"

The Chrysalis reveal

THE RETURN OF TIREK!!!

[KatonRyu 1,033]

Definitely the battle with Tirek, and even before that when Twilight was given all the magic of the princesses. That moment ties in nicely with my headcanon too, which made it more of a wtf moment since that very rarely happens.