Hotel checkout

When you check out of a hotel that uses cards for
keys (and they all seem to do that now), do not turn
the "keys" in. Take them with you and destroy them.
Those little cards have on them all of the information
you gave the hotel, including address and credit card
numbers and expiration dates. Someone with a card
reader, or employee of the hotel, can access all that
information with no problem whatsoever.