So many times a uniform or a truck is seen and trust is automatically given. If they truly are with a utility company, they will not mind you calling to confirm employment. A person is standing on the side of the road with an apparent broken down car. A vehicle following you driving yours, blowing horn, yelling, gesturing towards yours. Coming up beside to tell you that your car's tires, bumper, something in loose or even that there is fire in the back.
Victim pulls over to check it out and is often never seen again.
Please come with me. This one is so believable when delivered by someone in uniform. Children and adults both fall for this one. For your children, agree on a secret password that only someone you actually sent could know. In a parking lot, it is common to be approached for help in jump starting a car.