i had a guy at work asking me if ebay was secure, then saying he was buying a car off craigslist and the seller wanted him to use that...
since he just got to my department and i dont know him, i almost didnt give a shit, but then i basically explained the ad to him without seeing it (40% price of what its worth, wants to use ebay, cant see it in person, getting shipped, etc) and told him if he did it and got burned, i'd laugh my ass off at him