In an interview with German newspaper Handlesblatt, Musk was disdainful of Apple’s reported efforts to build an electric car, to hit the market by 2019. When the interviewer asked whether Musk was worried about the fact that Apple had hired some of Tesla’s “most important engineers,” Musk shot back: “Important engineers? They have hired people we’ve fired. We always jokingly call Apple the ‘Tesla Graveyard.’ If you don’t make it at Tesla, you go work at Apple. I’m not kidding.”

When asked whether he takes the competition seriously, Musk twisted the knife, saying:

Did you ever take a look at the Apple Watch? (laughs) No, seriously: It’s good that Apple is moving and investing in this direction. But cars are very complex compared to phones or smartwatches. You can’t just go to a supplier like Foxconn and say: Build me a car. But for Apple, the car is the next logical thing to finally offer a significant innovation. A new pencil or a bigger iPad alone were not relevant enough.