In 2017, Mark Zuckerberg returned to Harvard for a victory lap that most people can only dream of. Twelve years after the Facebook CEO dropped out of school to run what would become the largest online social network in the world, the elite Ivy League would give him an honorary degree. Facebook celebrated the event as an opportunity to showcase the company’s history and display a more personal side of its CEO, organizing a few public broadcasts ahead of the speech. One of those included a visit to Kirkland House H33, the room where it all started.

“This is the first time that we’ve been back in this dorm since I left,” Zuckerberg said in a Facebook Live video that he was filming from his smartphone. With his college sweetheart Priscilla Chan in tow, he directed viewers toward his old desk, and the rooms where his Facebook cofounders (and then-roommates) Dustin Moskovitz and Chris Hughes worked and slept. After some reminiscing about tiny bed sizes and dining hall cuisine, he addressed an incident that has, over the span of the past decade, become millennial folklore.

“One weekend I wanted to build this prank website, FaceMash,” he said with his signature indecipherable smile. “I basically sat here for, like, three days straight, and just coded this thing. And it was a prank. It was kind of funny but also a little bit in poor taste.” He summarized how it spread quickly, froze his laptop, and caused Harvard officials to turn off the entire dorm’s internet connection. “That was probably one of my more memorable moments from Kirkland House, just sitting here, and, like, I’m trying to fix this, Dustin’s trying to do his computer-science problem set, Chris is trying to write some paper for social studies or whatever he’s studying, and all the sudden the internet goes dark.”

[Read Alyssa Bereznak's piece examining Mark Zuckerberg's relationship with David Fincher's The Social Network.]