Chzo Mythos/YMMV
- Alternative Character Interpretation: Yahtzee implies in 6 Days that 7 Days was actually Malcolm's version of the events, and that he was possessed by the Welder and killed the whole crew. He neither confirms nor denies it in the commentary.
- Complete Monster: Chzo. He's also a Cosmic Horror. Yeah, we don't like it either.
- Crowning Music of Awesome: The Tall Man's harpsichord theme in Trilby's Notes.
- The theme is repeated at the climax of 6 Days a Sacrifice, in the scene with Theo walking through Defoe Manor, collecting the items that belong to the welder.
- The theme at the beginning and ending of 5 Days a Stranger, as well as the theme at the start of 7 Days a Skeptic. Both taken from RPGMaker 2000 they may well be, but that doesn't make them any less awesome or appropriate for the games.
- The introductory theme in 7 Days a Skeptic is a MIDI version of One Man's Dream by Yanni.
- Hilarious in Hindsight: A character in 7 Days just WANTS TO GO TO SPAAAAAAACCCCEEEEEEE
- Idiot Plot: Most the the story wouldn't really work if the characters behaved rationally and worked towards their predefined goals. This is especially true in 7 Days, where no one really knows how to do their job, and the ship itself seems to have been constructed by morons.
- A breakdown of what characters were supposed to be doing, and how they failed, is available here.
- Mary Sue: Trilby in 5 Days a Stranger. Yahtzee admits as such.
- Memetic Mutation: "I JUST WANTED TO GO INTO SPAAAAAAAAAAACE!"
- "I JUST WANTED [INSERT GOAL HEEEEEEEREEE!]"
- Narm: The twist ending in 7 Days is a bit lame to begin with, but "I JUST WANTED TO GO INTO SPACE!" would be hilarious even if the context had been better executed.
- Nausea Fuel: The alternate hotel in a Layered World. It's covered with blood and gruesome corpses dismembered beyond recognition, one of the worst being bloody handprints being found on the inside of an oven. However, It Gets Worse when after playing for a while, you notice that most of the guests and staff, including the clerk, have vanished from the normal hotel, and the blood and gore spread across the alternate hotel seems rather...fresh. Word of God states that the alternate hotel is indeed an alternate dimension, and the rest of "our world's" staff just wasn't captured by The Tall Man... of course, that's All There in the Manual.
- And before that, Taylor's room in 7 Days. When you finally get in, it turns out he's been butchering the crew and stitching the parts together into a new body for John DeFoe. The "leftovers" are everywhere, including the Meganekko's severed head, still wearing her glasses, lying on a table.
- And all of that is still nothing compared to the horrors the main character in The Expedition experiences, when he gets trapped in the body of Chzo.
- And before that, Taylor's room in 7 Days. When you finally get in, it turns out he's been butchering the crew and stitching the parts together into a new body for John DeFoe. The "leftovers" are everywhere, including the Meganekko's severed head, still wearing her glasses, lying on a table.
- Nightmare Fuel: And how!
- Trilby's Notes, in many respects. If you've played it, a handy way to avoid sleeping is to turn the lights off and listen to the music track that plays in the alternate hotel.
- So Bad It's Good: No, don't worry, not the games themselves. The Let's Play of the Mythos had various challenges and mini-contests between some of the episodes. One was to find the worst fan-made work for the series. Yahtzee himself participated, having found a community college made film based on 5 Days A Stranger. [dead link] It's about as cheesy and poorly acted as you'd expect, they can't pronounce "Trilby" correctly, for one thing.
- Surprisingly Improved Sequel: Trilby's Notes is by far the best game in the series, Ret Conning the worst mistakes of the previous two games and becoming very, very creepy.