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.