My Little Pony: Friendship is Magic - Smile Smile Smile

I made note of this on the KYM Pony General thread.
Pinkie says in the Smile song that there's only one thing that makes her happy is to make people smile.
She's not making people smile so her hair gets straight just like that.
Then it's revealed that if Pinkie can't make Ponyville Smile the whole town suffers.
Pinkie Needs them to smile and Ponyville needs Pinkie to make them smile.

I liked that moment too. She needs so badly for people to like her – it's good to see that they do.