!!The games
* From the ending of ''Doom II'':
-->The invasion is over. Earth is saved. Hell is a wreck. [[FridgeLogic You wonder]] [[LampshadeHanging where bad folks will go when they die, now.]]
* ''Doom 3'' explains why there are chainsaws on Mars: They got mixed up in an order for ''jackhammers''.
* Late in the third game, you can come across a terminal covered in blood. The terminal details how to perform a sacrifice to the forces of Hell written like cookbook instructions.
* Finding PDAs with entries complaining about spam mail, or planning parties is pretty funny if just for the contrast of them.
* [=MAP20=] of Doom II, ''Gotcha!'', becomes this in retrospect- the demons deployed their two most powerful monsters in the same spot, thinking it a foolproof plan. If Doomguy plays his cards right, they'll end up... [[EpicFail fighting each other]].
* The Xbox 360 Arcade port of Doom II has achievements that quote the Doom comic, including "You Have Huge Guts" for killing a Cyberdemon with your fists.

!!The [[Comicbook/{{Doom}} tie-in comic]]
* The comicbook in its entirety. Special mentions go to:
** "Stupid! Stupid! Stupid Imp! You're stupid! And you're gonna be stupid and '''dead!'''"
** "Imps? Zombies? You think you can get me?!? (''Thinks to himself'') Wait. Maybe they don't think. (''Starts yelling'') Well I do! And I think you're dead! Dead! '''Dead!''' '''DEAD!'''"
** "Knock knock who's there ME! [[MadnessMantra ME ME ME ME ME ME ME ME]]"
** "Aah! [[ChainsawGood Chainsaw! The Great Communicator!]]"
** "Now I'm RADIOACTIVE! That can't be good!"

!!Game Reviews
* The [[http://www.next-gen.biz/reviews/doom-review EDGE review]], starting with the infamous line "[[CompletelyMissingThePoint If only you could talk to the monsters...]]"

!!Game Mods
* The Rickroller. We would say "nuff said," but no; [[http://www.youtube.com/watch?v=SL0VncaV0D0 you've gotta see this one]].
* One visual glitch is that, regardless of where on the image an enemy's weapon is, its attack emerges from its midriff. This resulted in unintended humour in the "Ultimate [[Franchise/TheSimpsons Simpsons]]" Doom mod, where the Cyberdemon is Mr. Burns... and [[PhallicWeapon his rockets emerge from his crotch]].