It’s fair to say investors are none too happy with Elon Musk’s behavior during a recent appearance of his on “The Joe Rogan Experience” podcast.

The 47-year-old co-founder and CEO of the California-based Tesla Inc., did a bizarre interview with Rogan in which he was seen smoking a joint filled with both marijuana and tobacco.

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The stock market responded accordingly on Friday.

Tesla Inc. (TSLA on Nasdaq) dropped 6.3 percentage points, from $280.95 to $263.24 by 4:00 p.m., ending the week with a pretty significant loss.

Ironically, when Rogan initially pulled out the joint to smoke, he said to Musk, “You probably can’t because of stockholders.”

To this, Musk responded, “I mean, it’s legal, right?” and then proceeded to take a hit.

Ultimately, Rogan’s hypothesis about stockholders turned out to be correct.

Perhaps the drop had something to do not only with Musk’s smoking, but also with his contradiction of a previous claim.

Just a few weeks before Musk was seen smoking marijuana on video, he said he was not a fan of the drug because it “is not helpful for productivity. There’s a reason for the word ‘stoned.’ You just sit there like a stone on weed.”

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Apparently, he uses it, however.

There was other irony attached to Musk’s use of marijuana.

His SpaceX company is a NASA contractor. That means it’s supposed to be both a drug- and alcohol-free environment, according to Cornell Law School.

In the bylaws of NASA’s contractor agreement, marijuana is specifically noted as one of the drugs that NASA contractors are supposed to test their employees for — and there is a separate test for alcohol use.

Related: Here Are the Real Reasons for Tesla’s Coming Downfall

Even if it were not for his marijuana use, Musk’s interview certainly had its unhinged moments. For example, he seemed especially worried about regulating artificial intelligence.

“This time frame is not relevant to AI,” he said. “You can’t [regulate it] 10 years from the point at which it’s dangerous. It’s too late.”

Perhaps because Tesla makes electric cars, Musk also spoke in a panicky fashion about the use of fossil fuels.

“It’s the dumbest experiment in human history. Why are we doing this? It’s crazy.”

“There’s only so much oil we can mine and burn,” he said. “That’s tautological. We must have a sustainable energy transport and energy infrastructure in the long term. So we know that’s the end point, we know that. So why run this crazy experiment where we take trillions of tons of carbon from underground and put it in the atmosphere and oceans?”

“This is an insane experiment,” he added. “It’s the dumbest experiment in human history. Why are we doing this? It’s crazy.”

Musk also took the opportunity to talk himself up quite a bit. He called his brain a “never-ending explosion” of ideas and said that he has the “hardest job.”

Rogan also posted a photo on Instagram of Musk’s using a flamethrower prior to the interview.

As of Friday evening, the podcast has over 2 million views on YouTube.

Is this how the CEO of a multibillion-dollar company should be acting?

The stock market does not seem to think so — but Musk is free to make his own decisions. The only downside is that he has to live with any mistakes he makes.

Tom Joyce is a freelance writer from the South Shore of Massachusetts. He covers sports, pop culture, and politics and has contributed to The Federalist, Newsday, and other outlets.