My Little Pony: Friendship Is Magic2010

Pinkie Pie:
[narrating] My sisters and I were raised on a rock farm outside of Ponyville. We spent our days working the fields. There was no talking. There was no smiling. *sigh* There were only rocks. We were in the south field, preparing to rotate the rocks to the east field when all of a sudden...

[a large rainbow appears in the sky and makes Pinkie's hair poof out, previously being completely straight]

Pinkie Pie:
I never felt joy like that before. It felt so good I just wanted to keep smiling forever. And I wanted everyone I knew to smile too, but rainbows don't come along that often. I wondered, how else could I create some smiles?

[young Pinkie dashes off with an idea]

Pinkie's father:
[the next day] We'd better harvest the rocks from the south field.

Pinkie's mother:
Pinkamina Diane Pie! Is that you?

Young Pinkie Pie:
[pops her head out of the doorway of the silo, where loud polka music is coming from] Mom! I need you and Dad and the sisters to come in. Quick!

[her family walks in]

Young Pinkie Pie:
Surprise! You like it? It's called... a party!

[her family struggles with their facial expressions for a few seconds]

Young Pinkie Pie:
Oh. You don't like it.

[they suddenly burst into smiles]

Young Pinkie Pie:
*GASP* You like it! I'm so happy!

[young Pinkie gets her cutie mark]

Pinkie Pie:
[back on Scootaloo's scooter-pulling-a-wagon] And that's how Equestria was made!

Scootaloo:
Wha... huh?

Apple Bloom:
Look! We're here!

[Sugarcube Corner]

Pinkie Pie:
Maybe on the way home I can tell you the story of how I got my cutie mark. It's a gem!

Sweetie Belle:
Oh, come on. She's just being Pinkie Pie.