On why we should be nervous about the future if it turns out we're not living in a simulation: "Arguably we should hope that that's true, because otherwise if civilization stops advancing, that may be due to some calamitous event that erases civilization. So maybe we should be hopeful that this is a simulation, because otherwise... We are either going to create simulations indistinguishable from reality or civilization ceases to exist."
On Egyptians and aliens: "Seems like an opportune moment to bring up the Fermi Paradox, aka 'where are the aliens?' Really odd that we see no sign of them. Btw, please don't mention the pyramids. Stacking stone blocks is not evidence of an advanced civilization. The rumor that I'm building a spaceship to get back to my home planet Mars is totally untrue. The ancient Egyptians were amazing, but if aliens built the pyramids, they would've left behind a computer or something."
Source: Elon Musk on Twitter. Parts 1, 2, 3 and 4.
On the time he almost died from malaria while on holiday: “That’s my lesson for taking a vacation: Vacation will kill you.”
On one way he could die: “My family fears that the Russians will assassinate me.”
On why Tesla's office needs a roller coaster: “Everybody around here has slides in their lobbies. I’m actually wondering about putting in a roller coaster — like a functional roller coaster at the factory in Fremont. You’d get in, and it would take you around [the] factory but also up and down. Who else has a roller coaster? … It would probably be really expensive, but I like the idea of it.”
On the future of cars: “In the distant future, people may outlaw driving cars because it’s too dangerous. You can’t have a person driving a two-ton death machine."
He later clarified that he obviously wants people to keep driving cars because of Tesla.
On what he told Ford when the company said Tesla couldn't use the Model E name for a car: “Like why did you go steal Tesla’s E? Like you’re some sort of fascist army marching across the alphabet, some sort of Sesame Street robber?”
On flying cars: "I've thought about it quite a lot ... We could definitely make a flying car – but that's not the hard part ... The hard part is, how do you make a flying car that's super safe and quiet? Because if it's a howler, you're going to make people very unhappy."
On women: “I would like to allocate more time to dating, though. I need to find a girlfriend. That’s why I need to carve out just a little more time. I think maybe even another five to 10 — how much time does a woman want a week? Maybe 10 hours? That’s kind of the minimum? I don’t know.”
Bonus: It should be noted that this crazy idea from Elon Musk is becoming a reality. Meet the Hyperloop: "Short of figuring out real teleportation, which would of course be awesome (someone please do this), the only option for super-fast travel is to build a tube over or under the ground that contains a special environment."