Once Upon a Time, Season 1

Rumplestiltskin (stating his price for revealing what the Queen needs for the Dark Curse to work):
In this new land, should I ever come to you for any reason, you must heed my every request - you must do whatever I say - so long as I say ... "please!"

Evil Queen:
You do realize, that should I succeed, you won't remember any of this?

Rumplestiltskin:
Oh, well then, what's the harm?

Evil Queen:
Deal. What must I do to enact this curse?

Rumplestiltskin:
You need to sacrifice a heart.

Evil Queen:
I sacrificed my prize steed.

Rumplestiltskin:
A horse? This is the curse to end all curses - you think a horse is going to do? Great power requires great sacrifice. The heart you need must come from something far more … precious.

Evil Queen:
Tell me what will suffice?

Rumplestiltskin:
The heart of the thing you love most.

Evil Queen:
[angry] What I love most died because of Snow White.

Rumplestiltskin:
[in mock sympathy] Is there no one else you truly love? This curse isn't going to be easy. Vengeance never is, dearie. You have to ask yourself a simple question: How far are you willing to go?

Evil Queen:
As far as it takes.

Rumplestiltskin:
Then please stop wasting everyone's time, and just do it. You know what you love. Now go kill it.