Donna and The Doctor in “The Giggle”

You know what I did, when you went flying off in your blue box, spaceman? I stayed in one place, and I lived day after day after day.

It would drive me mad.

Yeah, it does. But you keep on going, and that's the adventure. The one adventure you've never had. 'Cause I've... I've worked out what happened. You changed your face, and then you found me. D'you know why?

No.

To come home.