Labyrinth.

Worm: 'Ello.

Sarah: Did you say hello?

Worm: No. I said 'ello. But that's close enough.

Sarah: You're a worm aren't you?

Worm: Yeah. S'right.

Sarah: You don't by any chance know the way through this labyrinth?

Worm: Who me? Nah, I'm just a worm. Come inside and meet the missus.

Sarah: No thank you. 

Worm: Things aren't always what they seem in this place.

 You can't take anything for granted. Come inside and have a cup of tea. 

Sarah walks through wall, only to find it's an entrance to another part of the Labyrinth.

Worm: Hang on!
Sarah: Thank you. That was incredibly helpful.

Worm: Don't go that way! Never go that way.

Sarah: Oh, thanks. Turns around and walks off.

Worm: C'orr. If she'd have kept on going down that way, she'd have gone straight to that castle.