| Customer: | Do you have any books on the dark arts? |
| Bookseller: | ... No. |
| Customer: | Do you have any idea where I could find some? |
| Bookseller: | Why don't you try Knockturn Alley? |
| Customer: | Where's that? |
| Bookseller: | Oh, the center of London. |
| Customer: | Thanks, I'll keep my eyes peeled for it. |