Jack Harkness: It’s been fun. But I guess this is goodbye.

Rose Tyler: Don’t talk like that. The Doctor’s gonna do it, you just watch him.

Jack Harkness: Rose. You are worth fighting for. (kisses her) Wish I’d never met you, Doctor. (kisses him too) I was much better off as a coward. See you in hell.

From Doctor Who – Season 1 Episode 13: ‘The Parting of the Ways’ (1×13)