“He wondered what aliens might think if they ever came across the Roadster drifting through space. After all, SpaceX packed other weird items in the car, among them a small toy Hot Wheels Roadster (complete with a miniature Starman) on the dashboard.
“Maybe [it will be] discovered by an alien race, thinking, ‘What were these guys doing? Did they worship this car? Why do they have a little car in the car?'” Musk said. “That will really confuse them.”‘
Source: Elon Musk’s Tesla Roadster Is Headed to the Asteroid Belt