Being a game that allows the player to do whatever they want, ''VideoGame/GarrysMod'' is bound to have a bunch of [[SugarWiki/FunnyMoments these]].

''VideoGame/TroubleInTerroristTown'' has its own page [[Funny/TroubleInTerroristTown here]].
!!The base game
* Placing a ragdoll into a wall or invisible physics object will cause it to flail around, making meaty thud sounds as it defies the laws of physics in the most ''awkward'' way possible. It's a staple of [=GMod=] {{Machinima}} for a reason.
* Faceposing can make characters have faces that come off as either this or NightmareFuel. The same thing applies to editing the bones of an NPC.
* You'll die if a prop gets flung at you too fast. This makes [=GMod=] one of the few games where you can kill an enemy using a {{toilet|Humor}} or a microwave.
* Thrusters can turn ''anything'' into a rocket that can fly into space (or at least the map border). [[Franchise/ToyStory To infinity and beyond!]]
* gm_flatgrass has a MockHollywoodSign that aptly reads "FLATTYWOOD". Bonus points for the map's hills resembling the [[UsefulNotes/MicrosoftWindows Windows XP background]].
* The description for the Rope tool:
-->A rope is exactly as it sounds. It's a rope that connects two objects. Or you could... you know... [[VideoGamePerversityPotential draw swear words on the wall with it.]]
* [[ThatOneAchievement The "Addict" achievement]]. Both its name and description qualify.
-->You have wasted a year of your life [[JustOneMoreLevel playing GMod!]]
* Most of the emotes you can do via the console, especially ''dance'' and ''muscle''.
* One of the stock props in the game is a doughnut. The textures are broken, it's ridiculously oversized, and the hole is a barely modeled black circle.

!!Mods
* Plenty of playermodels look extremely out of place in the game, given the ability to use realistic guns. Just imagine seeing something such as WesternAnimation/{{SpongeBob|SquarePants}} holding a ''.357 Magnum revolver''.
** Most playermodel packs include reskinned [=NPCs=], too, so you can make your favorite characters get into a gunfight. Some take it a step further, such as [[https://steamcommunity.com/sharedfiles/filedetails/?id=2175750122 this Peter Griffin model]], adding a buffed Combine Gunship that looks like an A-posing version of the character.
* The custom map [[https://steamcommunity.com/sharedfiles/filedetails/?id=207060996 Garry's Mall]] has some rather odd stores, including a FictionalCounterpart of Auntie Anne's called ''Uncle Gary's'', a store that sells Facepunch forum ratings, and a BlackComedy store called Black Factory.
** The map also has a European Union themed café called [[Letters2Numbers 3A57ERN [=BL0C=]]], with a rather [[{{Squick}} unusual]] menu. [[https://imgur.com/a/nxHRkIm Read it for yourself.]]
* In the map [[https://steamcommunity.com/sharedfiles/filedetails/?id=169600867 GM_BigIsland]], there is a small secret area with an S-shaped modern house. One of the only things inside is a painting of René Descartes' [[SarcasmMode most famous quote]]:
-->'''Painting:''' Give her the dick.
* The mod [[https://steamcommunity.com/sharedfiles/filedetails/?id=2971265319 NPC Voice Chat]] gives [[NonPlayerCharacter NPCs]] the ability to use custom voice lines on the same voice chat system as the players, and not only that, you can also control the pitch of the voices too, which leads to, ''interesting'' results; Usually, the enemy [[NonPlayerCharacter NPCs]] mainly use ''VideoGame/TeamFortress2'' voice lines for some reason. For example; imagine fighting an [[LightningBruiser Antlion Guard]], while it's shouting taunt lines such as "[[Characters/TeamFortress2TheHeavy Let us wrestle, little man!]]" in a [[VocalDissonance little squeaky voice]] at you. [[NightmareRetardant Now]] ''[[NightmareRetardant how]]'' [[NightmareRetardant scary would it be now after that]]?
* Most of [=GooBall60=]'s "trippy" maps, such as [[https://steamcommunity.com/sharedfiles/filedetails/?id=467212563 gm_parallax]]. They are very bright and colorful, which contrasts greatly with the typical bloody aftermath of most [=GMod=] shenanigans.
* The [[https://steamcommunity.com/sharedfiles/filedetails/?id=2801860110 Goofy Ahh Sounds]] pack, which replaces most of the in-game sounds with either {{meme|ticMutation}}s or cartoon sound effects. The thruster sound effect, for example, is replaced with the opening riff of the Series/BetterCallSaul theme song.
* The [[https://steamcommunity.com/sharedfiles/filedetails/?id=2689586530 Quick Fix SWEP]]. Based on a meme from ''VideoGame/TeamFortress2'', it allows the player to use the Sniper's rifle as a didgeridoo. The only way to stop is [[DeathIsTheOnlyOption pulling the trigger]].
** The [[https://steamcommunity.com/sharedfiles/filedetails/?id=2514027353 Escape Plan]], made by the same creator, is a revolver pointed towards your forehead. What makes it especially funny is that it makes the critical hit sound when used.
* There's [[https://steamcommunity.com/sharedfiles/filedetails/?id=2835405366 a mod]] that puts the (in)famous [[Music/LinkinPark In The Virtual End]] [[https://youtube.com/watch?v=M9J6DKJXoKk&feature=shares music video]] in [=GMod=]. There's even a chance that the vocals and instrumentals become out of sync.
* Vehicle addons such as Simfphys can include some fun vehicles to drive in, such as a drivable couch, the [[WesternAnimation/TheSpongebobSquarepantsMovie Patty Wagon]], and [[Franchise/{{Cars}} Lightning McQueen]].
* The NPC [[https://steamcommunity.com/sharedfiles/filedetails/?id=2882015917 "dr. isaac kleiner from hl2 recklessly driving a jeep"]] is ExactlyWhatItSaysOnTheTin. His ArtificialStupidity makes it even better.
* Two words: '''[[https://steamcommunity.com/sharedfiles/filedetails/?id=2965191792 Rickroll Nextbot.]]''' Not only is it '''''very much''''' ExactlyWhatItSaysOnTheTin, but it is also probably perhaps one of the ''[[{{Understatement}} only]]'' Nextbots that isn't scary at all.
* The [[https://steamcommunity.com/sharedfiles/filedetails/?id=1718637579 Take the]] NPC is a gravity gun that chases you while spamming two of Alyx's lines from ''VideoGame/HalfLife2: Episode One''. Press E on it, and it turns into the G-Man, who greets you before exploding.
* Similar to the above mentioned base-game emotes, you can also do the [[https://steamcommunity.com/sharedfiles/filedetails/?id=2642817723 TF2 taunts]] and [[https://steamcommunity.com/sharedfiles/filedetails/?id=1655753632 Fortnite dances]].
* Using the [[https://steamcommunity.com/sharedfiles/filedetails/?id=105920435 Model Manipulator]] on a City Scanner causes whatever model you selected to awkwardly A-pose towards you. Depending on who you ask though, this could also fall well within the UncannyValley.
* [[https://steamcommunity.com/sharedfiles/filedetails/?id=104691717 PAC3]] allows you to customize your playermodel however you'd like. The picture alone of a female Dr. Breen is incredibly funny for someone who's played ''VideoGame/HalfLife2''.
* [[https://steamcommunity.com/sharedfiles/filedetails/?id=950845673 Parakeet's Pill Pack]] include various pills that are simply [[RuleOfFunny there to be funny]]. One of them is a floating Doge head with [[FourTwentyBlazeIt 420 health]].
* On [[https://steamcommunity.com/sharedfiles/filedetails/?id=1617295051 gm_mobenix_v3]], there is the G-Man standing on a bridge near a bowling alley. Approaching him makes him [[SurrealHumor rocket into the air and explode into bananas]].
* [[https://steamcommunity.com/sharedfiles/filedetails/?id=2773405248 Zeta Players]], [[https://steamcommunity.com/sharedfiles/filedetails/?id=2947828836 Lambda Players]], and [[https://steamcommunity.com/sharedfiles/filedetails/?id=2880413233 S.A.P. Bots]] are always random in what they say and do. The former two even accept custom voice files, so you can make them all sound like WebVideo/{{Markiplier}} or [[Franchise/SuperMarioBros Luigi]].

!!Dupes
* Someone made a [[https://steamcommunity.com/sharedfiles/filedetails/?id=1804755137 melon]]. Made out of other melons.
* There's [[https://steamcommunity.com/sharedfiles/filedetails/?id=2786038405 a recreation]] of the WesternAnimation/{{Megamind}} "No bitches?" meme featuring the G-Man.
** There's [[https://steamcommunity.com/sharedfiles/filedetails/?id=2590193010 also]] a recreation of the pointing Wojak meme featuring [[VideoGame/Left4Dead2 Coach and Ellis]].
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