[ He's gruff, and Clara wonders if his life has made him that way, or if he always has been. ]

I'm a teacher on Earth. Luckily I still have access to coffee, otherwise, dunno if I could make it.

[ She's teasing lightly, continuing after a beat. ]

What happened to make coffee go away?

[ It's been the minute she allowed for, and the only thing she can think of is that the coffee plant went extinct. ]