Shell "Kangaroos" & "Smoke Signals" # In "Kangaroos," the driver of a van that is transporting a number of kangaroos to some zoo is surprised to find out just how much the choice of gas can affect his car's performance. In "Smoke Signals" an American Indian trying to signal to his relatives across some canyon with the help of the smoke coming out of his truck's exhaust pipe learns that Shell's diesel just doesn't produce enough smoke to be of any use to him. Fortunately, these days there are other means of communication available. Claim: You can tell when it's Shell.