Oh, sure. You can turn into a car, but if I want nice things suddenly it’s immoral to bend the fabric of human consciousness to satisfy my egoistic materialism.
Fun canon fact: if you leave futaba and yusuke alone they will start fighting, but if you leave them with Goro, they will join forces to roast Goro instead.
Also if you give the three of them food, they will forget what they were doing and get along.