Originally from The Register and stolen from here.
… Thousands of emails were sent to Spanish Internet users `thanking’ them for buying £350 worth of equipment from a fictional computer company. Their credit card would be debited the amount in two days, the email continued, but if they wished to query the purchase they need only call a free phone number, provided. When the hordes of panicking Spaniards called what was in fact a high-toll number charging £1 a minute, they were greeted with a recorded message telling them to wait until a representative was available.Of course, no one ever picked up the phone and the clock kept ticking for as long as the caller could stand…