Danny Phantom, Season 2

Future Vlad:
[telling how Dark Danny came into existence] If it's any consolation, they went so quickly. They felt no pain. Unfortunately, the same could not be said for you, Daniel. With nowhere else to go, you came to me, the only person on the planet who could possibly hope to understand your situation. All you wanted was to make the hurt go away. I honored your wishes... no more painful human emotions to drag you down. Sadly, that freed you up to rip the ghost out of me. And when my evil ghost half mixed with yours, my evil side overwhelmed you.

Danny:
What happened to my human self?

Future Vlad:
Some things, my boy, are better left unsaid. If any good came out of this, it's that ten years without ghost powers made me see what a fool I'd been.

Danny:
Maybe that's all anybody needs. A second chance.