So i went to a basketball game a couple months ago and was approached by one of those people with a stand inside the arena - it was to win a free cruise to the bahamas. Since all I needed to fill up was my name and number, I figured why not. They just called me and told me I was one of those picked for the cruise, but theres a catch: I have to attend 60min presentation about some product/service. After, I'll receive the voucher for the cruise. They said I have no obligation to buy anything. Question to you guys is: is this a scam? Will they somehow force me to buy something (I'd assume)?