This is Pinkie Pie's first image song from season 1 of Friendship is Magic.
When I was a little filly
And the sun was going down
The darkness and the shadows
They would always make me frown
I'd hide under my pillow
From what I thought I saw
But Granny Pie said that wasn't the way
To deal with fears at all
She said, "Pinkie, you gotta stand up tall
Learn to face your fears
You'll see that they can't hurt you
Just laugh to make them disappear."
Ha ha ha!
So giggle at the ghostly
Guffaw at the grossly
Crack up at the creepy
Whoop it up with the weepy
Chortle at the kooky
Snortle at the spooky
And tell that big dumb scary face to take a hike and leave you alone and if he thinks he can scare you then he's got another thing coming and the very idea of such a thing just make you wanna... He he he ha ha ha,