If you don't know what this is referencing, (I'd be surprised if you didn't), but just in case its the 'Fun' song from Spongebob. Go look it up, its awesome!
EDIT: wow, only 13 hours later and I've seen about 4 or 5 other places making this joke, I knew it was quite obvious but wow. Note to self: Be more original in future.
MLP:FIM is owned by Hasbro
Are you ready colts "Aye Aye Pinkie!"
I Can't hear you "AYE AYE PINKIE"
Who lives in a library inside a tree
A magic unicorn with OCD
when equestrian nonsense is headed her way
with the help of her friends it'll be child's play
TWILIGHT SPARKLE! AH AHH AHH AHAHAHAHAHAHAHHH...
"AAHHHH!!! AHHHH....! Anypony wanna' scream with me? No? AHHHHH!!!!!"
THAT BURNS DOWN THE WHOLE TOWN
U IS FOR URANIUM
N IS FOR NO SURVIVORS~
N is for anywhere and anytime at all,
down here in the deep blue sea~
Thats what pinkie would say or rather squee.
In the MLP:FIM episode, Luna is known as the most feared pony in Ponyville.
I think their more connected than we think. Plus, both episodes almost go the same way (except for the ending).
('Cause I know everyone was thinking it during that part.... )