The Powerpuff Girls, Season 1

Blossom:
Bubbles, the bus is about to leave.

Buttercup:
Whoa. How'd that horse get loose?

Bubbles:
Buttercup, this isn't a horse, it's my magical, mystical best friend unicorn.

[Blossom and Buttercup look at each other]

Buttercup:
I hate to break it to you, Bubbles, but that's no unicorn, that's a plain ol' pony.

Blossom:
No way. Ponies have shorter legs. It's a colt.

Buttercup:
A colt? What's a colt?

Blossom:
A baby horse.

Buttercup:
Then what's a filly?

Blossom:
A horse with attitude?

Buttercup:
Either way, it's definitely not a unicorn, it's just...

[She takes off the fake horn]

Buttercup:
...sad.

[As Donny begins to waver, he starts to speak]

Donny:
Well excuse me! I may not have a horn, but I do have a heart! and in that heart, I know I'm a beautiful unicorn!

Girls:
[gasps] You can talk?

Donny:
Yes, I can talk. But who cares? I'll never be anymore than just Donny the Wannabecorn.

Buttercup:
Whoa, drama bomb.