Customer: I bought two expensive dictionaries here half an hour ago, but I forgot to take them with me.
Manager: Who served you, sir?
Customer: The lady who is standing behind the counter.
Manager: Which books did you buy?
Customer: The books which are on the counter.
Manager: Did you serve this gentleman half an hour ago, Miss Roberts?
He says he’s the man who bought these books.
Miss Roberts: I can’t remember, sir. The man whom I served was wearing a hat.
Manager: Have you got a hat, sir?
Customer: Yes, I have.
Manager: Would you put it on, please?
Customer: All right.
Manager: Is this the man that you served, Miss Roberts?
Miss Roberts: Yes, sir. I recognize him now.
