* ''Marathon'' has several levels named after quotes from ''WesternAnimation/BeavisAndButthead'', such as the first level with lava being called "FIRE! FIRE! FIRE! FIRE! FIRE!," or the level with the first hidden flamethrower called "Smells like Napalm, tastes like Chicken!"
* ''Marathon'' level names are loaded with shout-outs... and bad Pfhor puns. Sometimes both at once.
** "[[Film/ApocalypseNow Smells Like Napalm]], Tastes Like Chicken"
** "[[Film/ForYourEyesOnly Pfhor Your Eyes Only]]"
** "MarsNeedsWomen"
** "[[Franchise/StarWars You Don't Need to See My ID]]"
** "[[{{Theatre/Hamlet}} Slings and Arrows of Outrageous Fortune]]"
** "WhatAboutBob?"
** "[[Literature/AliceInWonderland Curiouser and Curiouser]]"
** "If I Had a Rocket Launcher, I'd Make Somebody Pay" (Bruce Cockburn, ''[[ProtestSong If I Had a Rocket Launcher]]'')
** "[[Film/MadMax Thunderdome]]"
** "[[Franchise/StarWars No Disintegrations]]"
** "[[Film/PulpFiction OK, Honeybunny]]"
** "[[{{Theatre/Hamlet}} Poor Yorick]]"
** "[[Literature/DoAndroidsDreamOfElectricSheep Electric Sheep One]]"
** "[[Film/BladeRunner Electric Sheep Two]]"
** "[[Franchise/CthulhuMythos Strange Aeons]]"
** "[[Film/MadMax Beyond Thunderdome]]"
** "Music/HouseOfPain"
** "[[Music/ThePolice King of Pain]]"
** "[[Music/TheFugees 'Fugee Camp]]"