Many credit union members have been involved in a "grandparent scam" where the caller either claims to be a grandchild or the police that have the grandchild in custody. The grandparent needs to send money to "get them out of trouble". Now, not only are these victims being asked to wire or western union money, they are asked to get gift cards and phone the callers back with the numbers off of the cards.
What you need to know about "grandparent" scams
Scamming with iTunes gift cards