My Little Pony: Friendship is Magic, Season 1

Spike:
I'm gonna tell you two a secret. But you have to promise not to tell anyone.

Pinkie Pie:
Cross my heart and hope to fly, stick a cupcake in my eye.

[Pinkie and Twilight lean in to listen]

Spike:
Closer... closer...

[They lean in closer]

Spike:
[Confessing tone] I have a crush on Rarity!

Pinkie Pie:
[gasps] We won't say a word!

Twilight Sparkle:
Gimme a break, everypony already knows how you-

Pinkie Pie:
Twilight! You promised Spike you wouldn't say anything. He trusts you; and losing a friend's trust is the fastest way to lose a friend forever!

Twilight Sparkle:
But..

[Pinkie Pie pops up behind her]

Pinkie Pie:
Forever!