This is a cautionary tale about bank fraud for anyone that sells things. (online or otherwise). A man sold a car online, the buyer sent a check for several thousand more than the buying price. He claimed it was to cover extra shipping costs and for the seller to just wire him the excess which turned out to be $5000. He felt a bit suspicious of the check and inquired a couple times if the check was ok, the teller confirmed that the check was fine.