I was
thinking more about the part where they switch between their "crystal and happy" form and "sad and earth pony
Their appearance is the symptom, not the cause.
Now, of course, my tastes aren't going to be identical to anyone else's, but, we once made lists of how we'd tier the episodes. This is mine, based on my own enjoyment, from best tier at the top:
Canterlot Wedding, Hurricane Fluttershy, Lesson Zero, Return of Harmony, It's About Time, Suited For Success, Green Isn't Your Color, Hearth's Warming Eve, Luna Eclipsed
Bridle Gossip, Cutie Pox, Dragonshy, Party of One, Read It and Weep, Baby Cakes, Sonic Rainboom, Swarm of the Century, Cutie Mark Chronicles, Stare Master, The Crystal Empire
Sweet and Elite, Hearts and Hooves Day, Secret of My Excess, Best Night Ever, Winter Wrap Up, Family Appreciation Day, May the Best Pet Win!, Boast Busters, Putting Your Hoof Down, Friend in Deed, Friendship is Magic
Bird in the Hoof, Sisterhooves Social, Dog and Pony Show, Ponyville Confidential, Last Roundup, MM Mystery on the Friendship Express, Super Speedy Cider Squeezy 6000, Dragon Quest, Mysterious Mare Do Well, Feeling Pinkie Keen
Show Stoppers, Call of the Cutie, Owl's Well That Ends Well, Look Before You Sleep, Applebuck Season, Ticket Master, Fall Weather Friends, Griffon the Brush Off, Over a Barrel
EDIT:
![[up] [up]](https://static.tvtropes.org/pmwiki/pub/smiles/arrow_up.png)
Well, as I said, my tastes will be different. Personally, that's part of what makes Twilight my favourite character and so lovable and identifiable and interesting and yes, fun.
edited 13th Nov '12 5:45:40 AM by Sereg