You are the maddest, most beautiful thing I've ever experienced and I haven't even scratched the surface. I wish I could stay. But if either of us are going to survive, you're going to have to let me go and keep on being brilliant by yourself.

The Doctor

The Doctor: The Solitract is a frog? Who talks like Grace?
Solitract Frog: My own form is endless but this frog is a form that delights me as it once delighted Grace.
The Doctor: There's me thinking the day had no more surprises left.

This woman is clearly an alien force, collapsing two realities and impersonating your dead wife. Time to move on, mate!

The Doctor

She's not your wife! She's furniture with a pulse.

The Doctor

The Doctor: Solitract! It's a theory, a myth, a bedtime story my Gran used to tell me.
Yaz: You had a grandmother?
The Doctor: I had seven but Granny Five, my favorite, used to tell me about the Solitract.

The Doctor: What did he look like? This man.
Ribbons: No horns. One mouth. So ugly. Like you. But such nice big boots.

Ribbons: Bird is lunch. Maybe codger is tea.
Graham: Who are you calling a codger? It's you who stinks of his own wee.
Ribbons: That's not my wee.
The Doctor: Let him go cause you do not want those words to be your last ones.

The Doctor: Both of you. Stay clear of the mirror. It's already tried to lure in Graham.
Ryan: Yeah.
Graham: Hey. All of us, it lured. It's not like I gave it credit card details.

Graham: Hey, Doc, do you think it's safe?
The Doctor: I doubt it. It's a jittering dimensional portal in a mirror in a Norwegian bedroom.

Ryan: Woah. Why are we not in the mirror?
Graham: I don't know.
Ryan: We'd know if we were vampires, right?

Not hungry are you? Because these days, I always carry a cheese and pickle sarnie. Y'know, just for emergencies.

Graham

Ryan: Maybe we shouldn't be in here.
Yaz: There's a child in this house.
Graham: Or some maniac who collects kids' shoes.

Doctor Who Season 11 Episode 9 Quotes

The Doctor: It's only 2018. I thought we'd leaped into the Wooly Rebellion.
Yaz: Sorry, what?
The Doctor: The Wooly Rebellion. In 193 years, there's a total renegotiation of the sheep-human relationship. Utter bloodbath.

Graham: Got your bearings yet, Doc?
The Doctor: Norway. Definitely Norway. One of the frilly bits on the top.