Several recent posts suggested to me that I should share this important Gedankenexperiment (I was about fifteen when it occurred to me).
Half time at the Superbowl. The President of the United States takes the stage and addresses his fellow Americans: "I ask you all to participate in an unprecedented and important scientific experiment. Without your cooperation, this vital research cannot be carried out, etc. etc." The country's most popular sports figure then takes over to explain the details. Roustabouts bring out a large fluorescent orange tarpaulin and place it in the exact center of the field, brilliant against the green. A small cage is placed in the center of the tarpaulin. In it is a hamster. Most popular sports figure: "OK, everybody, now, HATE THAT HAMSTER!"