"No! It absolutely cannot be, but my couture sizing sense is never off!"
The Pinkie Pie issue naturally has a few laughs, but possibly the best line in it comes from Twilight. When Pinkie is doing her song and dance number to cheer up Ponyacci, he turns to Twilight (who's playing piano) to ask if she's trying to convince him not to retire as well.
Twilight Sparkle: No, I'm just providing props and background music.
Applejack nodding off as she lies in wait for the Sass Squash:
Applejack: Apple cobbler. Apple burrito. Apple... apple.
Applejack's attempt to get into the mind of Sass Squash:
Applejack: "Gorg! I love the woods!" "Hurk! Bein' elusive is the life for me!" "Bork! Moss is comfortable and delicious!" Now I'm gettin' it! (AJ notices the rest of her family staring at her)
Applebloom brainstorms different ways to catch the Sass Squash:
Applebloom: Oh, oh, we could put on a play! That it would want to come and watch? Or, or...I could play my fiddle! "Music soothes the savage beast!" Maybe if we could coat the ground with gumballs it would trip on them? We could train Winona to sniff it out! Magnets! How do they work?!
Applejack attempts to use mirrors to catch the Sass Squash in the act. It seems like a sound tactic at first....until she finds her brother of all ponies, using said mirrors as a vanity!
The montage of Spike giving the Sea Beasts a crash course in history, math, and other subjects.
The inside cover — Luna standing on a pile of empty coffee cups and thermoses, with wide bloodshot eyes, proclaiming "I feel like I could do anything! I'll bet I could fly!" And at the bottom of the pile Celestia is calling up "I'm switching you to decaf".
When Luna is getting bored of the guards' stories, we're treated to a dramatic page of a sinister-looking cloaked figure going into a condemned part of the city... it turns out its just Celestia sneaking into a hidden fancy spa to enjoy her day off.
A very tired and hungry Luna begging Kibitz to let her have cake for lunch with Puppy-Dog Eyes.
Kibitz: Do you know what all that refined sugar will do to you? Luna: It will make me most happy.
Luna reading today's mail to Celestia from Twilight, there's tons of it.
Kibitz reassures Luna that Celestia must fully trust her to do her duties...before cutting in that Celestia must also be watching in the shadows in case Luna does screw up so the former can fix it. Cut to Celestia sleeping in the spa with cucumber slices and a magazine...
She also appears to jump as much as she walks or runs, it's just as adorable as it sounds.
The face Luna makes as she goes "WHAT."
Luna plays Pony Chess with Fancy Pants. When Kibitz pulls her away to her next task she has to be dragged by the tail shouting "YOU ARE MAKING ME LOOK MOST UNDIGNIFIED. LET ME GO BACK TO MY FESTIVITIES AND SMITE THINE BLUE-HAIRED ENEMY!" It's even funnier in the stinger, where we see Fancy Pants and the party guests are still standing there long after the day has ended (and Luna has forgotten).
Luna shutting Kibitz up by way of stuffing a bunch of papers down his throat when she's had enough. The way his mustache flies up, especially!
The comic ends recounting just what Luna was doing the night before the comic, where she looked around for the forest for a pet, a creature of the night worthy of a princess. She chooses an opossum, which she names Tiberius.