What's your favourite Pinkie Pie episode and why?

The question is simple: What’s your favourite Pinkie Pie episode and why?
 
I love a lot of Pinkie Pie episodes. Swarm of the century, Feeling Pinkie Keen, Griffon the brush Off… But my favourite by far has to be Party of One. The story is really great, the characters are likeable and I love watching Pinkie Pie becoming Pinkamena Diane Pie.
 
To be honest, I love one detail from Cutie Mark Chronicles, and that’s the past of Pinkie. A happy, likeable and charming character was sad when she was a little pony. It could have been easy to make a happy childhood for her, but no. Even better, they decided to make a farm of rocks. With that detail in mind, watching Pinkie Pie as Pinkamena was kinda sad. But the episode is still prety funny. When she became crazy and she was talking to stones and buckets, man, that was the funniest moment I’ve ever seen in the show.
 
It’s still one of my Top 3 favourite episodes in the entire show.
 
This was the first time where the happy and charming Pinkie became crazy and we were invested. I say this because the episode was released in a moment where Pinkie Pie wasn’t supposed to be as annoying, creepy or shouting as she is in almost every single episode since Too many Pinkie Pies from season 3. And I miss that Pinkie Pie.

I think I’d actually go with two episodes from season 4. “Pinkie Apple Pie” (because in addition to having a good song and some fairly amusing Pinkie moments it also manages to be a fairly touching episode), and “Pinkie Pride” (because it’s not often that we get to see Pinkie Pie have an existential moment, and because I’m a big fan of Weird Al).

Tough question, Ponk’s got a lot of good episodes.
 
Probably something like A Friend In Deed or Pinkie Apple Pie. Maud Pie (episode) is really good aswell but that’s more ensemble.