HOW TO BUY A PRESENT?
A man walked into a department store and told an assistant he'd like to buy a present for his wife. 
"Certainly, sir," replied the assistant.
"Perhaps a dress or a blouse?"
"Anything," said the man.
"And in what colour?"
"It doesn't matter."
"Size?"
"Immaterial."
Seeing the assistant's confusion, the man explained that whenever he bought his wife something she would always take it back to the shop and exchange it.