This may be most common with debit cards— as we've noticed before that debit card numbers frequently include your account number (http://news.ycombinator.com/it

This may be most common with debit cards— as we've noticed before that debit card numbers frequently include your account number (http://news.ycombinator.com/item?id=1939699 http://news.ycombinator.com/item?id=1939699)