This is a scam of the lowest order.  The caller will act as if he/she is fumbling around with his/her headset, then ask if you can hear them now.  Do NOT under any circumstance say the word "yes" or anything like it.  As one poster said, it's someone selling cruises but this is worse because the people making the call are recording it, and they'll doctor the recording to have you saying "yes" in response to the question of whether you want in on the cruise, even if you hang up on them before then.  Then they start sending you the bill.  This is nationwide and a lot of people have been ripped off.