Launching a Tesla Roadster into space on the Falcon Heavy rocket: In 2018, SpaceX launched its Falcon Heavy rocket, with a Tesla Roadster as the payload. The car was sent into orbit around the sun, with a mannequin dressed as Starman in the driver's seat. This was not only a demonstration of the Falcon Heavy's capabilities, but also a publicity stunt for Tesla and SpaceX.
Digging tunnels under Los Angeles: In 2017, Musk announced plans to dig a network of tunnels under Los Angeles to alleviate traffic congestion. The project, called "The Boring Company," has begun construction on test tunnels. The goal is to create underground transportation systems that would allow cars to travel at high speeds, bypassing traffic on the surface.
Building a high-speed transportation system: In 2013, Musk proposed the "Hyperloop," a transportation system that would use vacuum-sealed tubes to propel pods at speeds of up to 700 mph. This would allow for travel between cities at unprecedented speeds, potentially revolutionizing transportation.
Sending a spacecraft to Mars: SpaceX has been developing the technology to send spacecraft to Mars, with the ultimate goal of establishing a human colony on the planet. This is considered one of the most ambitious and difficult tasks ever attempted by a private company, and it still in progress.
Using a flamethrower as a promotional tool: In 2018, The Boring Company sold flamethrowers as a promotional tool, which led to some criticism. It was considered a bizarre move by many, as The Boring Company is primarily focused on tunneling and transportation, rather than flamethrowers.
Announcing his desire to merge human brains with AI: In 2017, Musk announced that he was developing a neural lace technology, a brain-computer interface that could be used to merge human brains with AI. This idea is considered highly controversial and speculative, as it raises ethical questions about the nature of human consciousness and the potential consequences of merging with machines.