Linus Torvalds doesn’t usually seek the spotlight, so it was a pleasant surprise to see him appear a few days ago as a guest on another well-known Linus’s show—Canadian YouTube star Linus Sebastian from the Linus Tech Tips (LTT) channel.

Depending on who you ask, the two have very different kinds of fame. One is the creator of the operating system that reshaped modern computing. The other has more than 16 million followers, and it’s hard to find a tech enthusiast who hasn’t seen his videos. But as Torvalds joked at the start of the video, when signing a book about himself, “To fake Linus from the real one.”

The premise of the video—building the “perfect” Linux PC, as the title “Building the PERFECT Linux PC with Linus Torvalds” suggests—is mostly just a vehicle for the conversation. The focus isn’t really on assembling the machine but on the dialogue between the two and Torvalds’ answers to questions that many Linux users have long been curious about.