Tuesday was a serious day in the life of Mark Zuckerberg.
So serious, he wore a suit.
The CEO of Facebook ditched his usual ensemble of a gray t-shirt and jeans for a suit jacket and tie Tuesday to testify in court that his virtual reality company, Oculus, wasn't stolen technology.
The trial, which began last week, is taking place in a Dallas federal court.
The accusations directed at Facebook come from ZeniMax Media, the video game creator behind popular titles like Doom, Quake and Fallout, and centre around one man: John Carmack.
Oculus had hired Carmack from ZeniMax to serve as its chief technology officer back in August 2013.
A few short months after Facebook acquired Oculus in March 2014, ZeniMax filed a lawsuit accusing Oculus - via Carmack - of stealing intellectual property.
Carmack, in his testimony last week, denied directly using his work at ZeniMax to build Oculus, which currently sells a virtual reality headset for $599 and is planning much more.
On Tuesday, Zuckerberg, who was the one who orchestrated the deal in 2014, took the stand to reiterate and broaden those claims.
It was Zuckerberg's first time testifying, he admitted, but the young CEO is not unfamiliar with lawsuits.
He was sued by former Harvard classmates, again for stealing intellectual property, to create Facebook.
The lawsuit was settled privately.
"I'm here because I believe [the claims are] false, and it's important to testify to that," Zuckerberg said. "The idea that Oculus products are based on someone else's technology is just wrong."
Zuckerberg also filled his testimony with zingers that framed Facebook as powerful and ambitious, as tweeted and written by The New York Times and Gizmodo reporters who were inside the Dallas courtroom.
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