I'm glad you left out the hyperloop/boring company and the intercontinental travel rocket out of your list. He might be a great computer engineer, but i think the most stupid thing i ever saw is the Vegas loop. At least it was entertaining (and oh boy, i hope his intercontinental travel rocket have a few launch, this is promising).

I do like Elon, though my sympathy for Tesla and SpaceX will probably be overshadowed by contempt and amusement at another "Vegas loop" (the "loop" for the Dodger Stadium was even dumber, i'm a bit sad that this did not work.)