Well, yes, but. [When Donna puts it like that... maybe it's not such a stretch to believe in life on other planets when she fell into an entirely new universe. Still, for some reason her mind has more trouble wrapping itself around the idea of getting into some sort of box and flying into the sky to another planet.]

You could really travel through all of space and time? Anywhere you wanted? Any time? And were you traveling with him for long? What did you see? Where did you go?

[Caitlyn's always wanted to see the world, a magic box that's bigger on the inside and that can go to any time or place sounds like a dream come true.]