I owe the Hacklab.to people an apology. Last spring I ran this post about how they'd tuned the motor on their laser cutter to play the Super Mario Theme as it repositioned itself, and I mentioned that it was too perfect, and wondered "if it's not just some video of a laser cutter with a flanged-out version of the theme cut into the soundtrack."
Yesterday, I dropped in at the Hacklab in Kensington Market (it's an amazing place), and saw the laser cutter do its thing. And you know what? It plays an absolutely perfect Super Mario Theme. Seriously.