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Long distance calling cards are a prime target for such attacks, usually in airports. The thieves position themselves to be able to see when you type in your access code and make a call. Later, they steal the card and use it to run up huge long distance bills. Some especially daring criminals just borrow the card and later return it after using it, claiming to do you a favor by returning the card you supposedly dropped.
What is an example of a non-computer related privacy attack?