All Hotels Informative - Don't Give Out Your Credit Card
A co-worker of mine just stayed in a hotel and almost willingly gave out his credit card over the phone.
He got a call from someone saying that they were from the front desk and that the credit card they had given for incidentals was accidentally deleted and they needed them by 7am for a report.
My friend was about to head down for breakfast, so he said he would just swing it by the front desk - the guy on the phone said OK, but he had to have it by 7am.
When he got down to the front desk the two guys had no idea what he was talking about - they had not had transferred any calls in over an hour, so the scammer was either calling from a room, or one of those courtesy phones in the hallway.
Don't even give your your CC over the phone unless you place the call!