My Little Pony: Friendship is Magic, Season 1

Twilight Sparkle:
[explaining a plan to Pinkie] On her own, Fluttershy could never do something unattractive, but if I use my magic to make her do something unattractive, Photo Finish wouldn't want her to model anymore, then Rarity wouldn't be so jealous; and I'll no longer have to keep both of their secrets! You have to promise not to tell anyone. Please?

[Without speaking, Pinkie draws her hoof over her mouth, twists it, paws at the floor, waves her hoof over the area she just pawed, draws a triangle shape in midair, and takes a step forward.]

Twilight Sparkle:
[confused] ...So, you do promise, or you don't promise?

Pinkie Pie:
Uh, yes! [repeating the motions] Obviously, that's why I zipped my mouth closed, then locked it with a key, then dug a hole, then buried the key, built a house on top of the hole where I buried the key, and moved into the house built on top of the hole!

Twilight Sparkle:
[deadpan] ...Obviously.