We don't want to terrify anyone into swearing off delivery pizza altogether, but people aren't always what they seem, and pretending to be the pizza guy, or using pizza delivery as a cover for casing homes to return and rob them later, isn't unheard of. We like to think of pizza delivery as a higher calling, but a Fargo, Minn., man used it as a cover for assault and robbery. It's never a good idea to take things at face value, even pizza. Lock your doors; instruct your children about proper stranger etiquette; and pay attention to things that seem off, like someone spending too much time staring at your new flat screen or asking about your work schedule. Even the pizza guy may have ulterior motives, so use common sense and caution.