No, that's not a lie - one Pekka Väänänen, a Finnish modder, has managed to get the original Quake running on an oscilloscope.
What's an oscilloscope? This:
"An oscilloscope is an electrical testing device used to measure the frequency of an electrical signal over time, and display waveform signals in a graph."
What's Quake? This:
"Quake is a game in which players must find their way through various maze-like, medieval environments while battling a variety of monsters using a wide array of weapons."
You'd be right to wonder just how the hell all of this works, or what it looks like. Luckily for you, you can read about Väänänen's trials and tribulations right here, and check it out in video form on this very page:
At the risk of editorialising somewhat: that is so, so cool.