You Can Say One Thing To Your Fav Pony, What Is It?

[Evil Pink One 12,963]

"you're crazy... Now sign my hoof"

[Splashee 28,537]

To Derpy: "You are freeee!"

 

Spoiler

That has so many meaning

 

[Tom Gallagher 33,521]

Mane Six, Elements of Harmony, I've gotta be absolutely honest with you... Thank you, thank you for everything. I wouldn't be anywhere without all of you so thank you. I love you all forever. Group hug! *hugs them all*

 

(I'm getting emotional typing this) 

[Passion 3,478]

"Allow me to tell you humanity's greatest weaknesses..."

[Splashee 28,537]

"For the words I want to say, somethin', somethin', somethin', somethin'... Be mine!"

[EpicEnergy 22,072]

It would probably be "I love you!".

[King of Canterlot 9,588]

"Will you be my special somepony, Twilight?" 

[Savygriffs 5,021]

"I love you, Fluttershy, would you like to go to the zoo with me and have a picnic?"