I just had to get my credit card cancelled.
I was viewing my netbanking details, about to do my regular password change, plus pay a gas bill, and found that a $500 transaction was pending. It was dated yesterday at 2:40am, when I was sound asleep in bed, and for a company I've never heard of. Unfortunately, as part of the transaction dispute process, the bank cancels my existing card. The new one will be sent to me about 6 working days from now. Fortunately, I'm still 5 weeks away from flying to the European Alps for my cycling trip: it would have been a major nuisance if it had occurred several weeks later.
I don't know if it was just incompetence (someone entering the wrong credit card number when performing a transaction) or malice, but either way it's a bloody nuisance.