Here is an email I got to day on a local gas scam. Hope this sort of thing doesn’t take hold:

Subject: Alert from the Neighborhood Watch of Colorado Springs Police
Department

Most of us use credit/debit cards at the gas pump. With the price of
gas and people getting desperate, this is likely to occur more often.
Please be careful out there!

A co-worker used her credit/debit card to purchase gas at the pump (like
most of us do). She received her receipt like normal. However, when
she checked her statement, there were 2 $50 charges added in addition to
her purchase. Upon investigation, she found out that because she did
not press the ‘clear’ button on the pump, the employee inside the store
was abl e to use her card to purchase his/her own gas! To keep this
from happening, after you get your receipt, you must press the ‘CLEAR’
button or your information will be stored until the next customer
inserts their card. Be sure to tell all your friends/family so that
this doesn’t happen to them!