A look back at Elon Musk's love of juvenile humor as the Tesla CEO turns 52: from jokes about 420 and 69 to 'Titter'

• Elon Musk has joked his birthday is exactly 69 days after 4/20. He turned 52 on Wednesday.

• It's rare that the billionaire goes a day without cracking some kind of joke.

• Here are some examples of Musk's middle-school humor — from 420 jokes to marketing gag merchandise.

Elon Musk has long been known for his sense of humor — for better or worse.

From constantly posting memes on Twitter to creating gag products, it's rare that the 52-year-old goes a day without cracking some kind of joke.

Last year, Musk called humor "one of the great joys of life."

Source: Twitter

Musk's jokes have been known to ruffle feathers, and they haven't always been the most savory.

Experts previously told Insider that Musk's online antics — from jokes about masturbation and Hitler to starting feuds on Twitter — could be harmful to his companies

"When you have a CEO who is making those types of comments, it can be very off-putting," Nicole Stgerman, the Lead Outreach and Education Coordinator at Equal Employment Opportunity Commission told Insider in 2022. "There's a reason you don't see other executives saying these kinds of things. The CEO both creates and represents the culture of his company."

In the past, some of Musk's comments on Twitter have landed him in hot water with the Securities and Exchange Commission, and have been cited in several employee lawsuits against Tesla.

Source: Insider

Most recently, Musk cracked a joke about the short-lived Wagner Group rebellion in Russia.

Musk posted a meme with an adult joke about the aborted rebellion on Sunday.

Source: Twitter

It was one of many sexual jokes Musk has made on Twitter.

Earlier this year, the billionaire changed the sign at Twitter's San Francisco headquarters to "Titter." Musk said on Twitter in April that the "W" on the Twitter sign at the company's San Francisco headquarters had been painted over.

"Our landlord at SF HQ says we're legally required to keep sign as Twitter & cannot remove 'w', so we painted it background color," the billionaire tweeted.

Before Musk announced the change, several Twitter users had posted pictures of the sign in which the "w" appeared to have been taped over.

The billionaire's joke struck a chord with one of his former lieutenants at Twitter, who called him to task for it.

Sources: Insider, Twitter

The billionaire has also been known to make his fair share of boob jokes.

In 2021, Musk joked that he wanted to start a school that would have the acronym "TITS," adding that it would have "epic merch."

"Am thinking of starting new university: Texas Institute of Technology & Science," he tweeted.

The tweet received some backlash online and was later cited in a sexual harassment lawsuit against Tesla.

Source: Twitter, Insider

Musk often incorporates references to marijuana into his jokes.

Earlier this year, he announced that Twitter would start eliminating legacy blue checks for users that had not subscribed to Twitter Blue by April 20. This was a nod to one of his classic jokes, as the date is also an unofficial holiday for cannabis smokers.

The billionaire has incorporated the number 420 into many of his ventures over the years.

In January, Musk said he thinks 420 has "karma," but he's not sure if it's "good or bad." The Tesla CEO made the comments during a trial over a tweet in which he said he had secured funding to take the car company private at $420 per share.

The number was also part of Musk's Twitter deal. He took the company private at $54.20 per share in October.

Sources: Insider, Twitter, Futurism

He also frequently cites the number 69, which is a sexual reference.

In 2021, Musk said it was "a total coincidence" that stacking SpaceX's Super Heavy Booster 4 and the Starship prototype Ship 20 would reveal the number 420. He also volunteered that the booster's height was 69 meters after the company cut it down for "manufacturing efficiency."

Source: Twitter

In 2020, Musk changed the starting price of the Tesla Model S to $69,420.

He also listed Tesla's "S3XY" shorts at a price of $69.42.

Sources: Insider, Twitter

Musk has also pointed out that his birthday is 69 days after 4/20.

Despite all the weed references, Musk has said he doesn't "even know how to smoke a joint."

The billionaire said last year on the Full Send podcast that he and the "whole of SpaceX" had to be drug tested for a year after he smoked weed on a 2018 podcast with Joe Rogan.

Sources: Insider

The billionaire doesn't just like to crack jokes on Twitter.

The day before he officially bought Twitter, Musk showed up at the company's headquarters with a bathroom sink.

"Entering Twitter HQ – let that sink in!" Musk tweeted after spending months preparing to battle the social media company in court over his attempt to back out of the $44 billion purchase.

Source: Insider

In April, Musk told BBC his Shiba Inu, Floki, is the CEO of Twitter.