“The Simpsons” welcomed billionaire inventor and entrepreneur Elon Musk to Springfield on Sunday night, when Musk was presented as an uninspired visionary in need of new ideas. Naturally, Homer Simpson’s incoherent ramblings proved to be a muse for the man behind Tesla and SpaceX.

The episode ended with Musk blasting off into space in his SpaceX Dragon craft. “Hmm, for a man who likes electric cars, he sure burns a lot of rocket fuel,” Lisa Simpson noted after the launch.

(“The Simpsons”)

Burn. That jab from Lisa prompted a “well, actually…” response from Musk: After the show aired, he fired off a series of tweets explaining why the Dragon spacecraft doesn’t use an electric rocket.

Musk went beyond the SpaceX to explain how far off we are from things such as, say, elevators to space.

He also left followers with a parting thought regarding the use of electricity in space travel.

But real-life Musk didn’t address other inventions seen on the show; what of this self-packing suitcase, for instance?

(“The Simpsons”)

This isn’t the first time that people have fact-checked the physics behind “The Simpsons.” Earlier this month, the “MythBusters” guys dedicated an episode to testing out some of the most iconic “Simpsons” scenes, including that time Homer attempted to stop a wrecking ball from knocking down his house.

MORE READING: ‘MythBusters’ to test scenes from ‘The Simpsons.’ Here are five that should be re-created.

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