Tesla and SpaceX CEO Elon Musk on Tuesday tweeted a cryptic message, "x.com/x."

Clicking on this URL leads you to http://x.com/x. A totally blank, non-secure webpage save for the single, lower-case letter "y" standing all by its lonesome on the upper left hand corner.

"Y" sounds like "Why?" when pronounced. So, the questions facing those who dared to click on the suspicious link all seem to start with Why:

"Y are you here?"

"Y is there a letter 'y' here?"

There's apparently a method to Musk’s madness. It starts with the fact that the website x.com eventually became PayPal, Musk's first multi-million dollar creation. In July 2017, Musk bought back the domain name, x.com, from PayPal for an unknown sum. This sum probably exceeded $10 million, according to some sources.

After re-acquiring x.com, Musk tweeted, "Thanks PayPal for allowing me to buy back X.com! No plans right now, but it has great sentimental value to me."

The $165 million he earned from selling PayPal helped Musk launch SpaceX and Tesla, which are both worth a combined $80 billion with $64 billion of that going to Tesla.

Perhaps the original x.com tweet that leads to the letter “y” really means “Y did I sell x.com in the first place?” It’s a theory good as any other given the paucity of facts.

Musk's Twitter followers also had their own theories about the cryptic post. Some think the "y" on the website is a teaser to the upcoming Tesla Model Y, while some just had a few laughs clicking on what seemed like a very suspicious, clickbait link. 

Despite the shady post, fans flooded onto x.com enough to crash the site's server. Error messages that the site canot be reached after a few hours have been shared on Twitter as well

Will we ever know what the great Elon Musk meant by "y"? 

Sole content of Elon Musk's x.com website Sole content of Elon Musk's x.com website Photo: x.com