Background: Students were given a speech on being safe and making smart choices. For example, "stranger danger" and "look before you cross the street," etc.
Student: "What about a hitchhiker?" Teacher: "Does everyone know what a hitchhiker is?" (Students all answer yes) Teacher: "Okay, can you tell me why hitchhikers are dangerous?" Student: "I know! I know! It's because if you stand too close to a truck when it drives by you can get your thumb knocked off!"