History YMMV / AvengersInfinityWar

** From the first official trailer, the group shot of the reformed Avengers and Black Panther leading the Wakandan army against a horde of Outriders.
** The second official trailer has Captain America holding off Thanos with the Infinity Gauntlet.
** The first fight scene of the movie, where we see Thanos [[CurbStompBattle effortlessly beating down the Hulk.]]
** Thanos tearfully sacrificing Gamora to get the Soul Stone.
** The Battle of Wakanda and the Battle on Titan.
** Thor with Stormbreaker arriving into Wakanda and nearly killing Thanos.
** Thanos's fingersnap and all of his victims turning into ash one after the other.

** Those who felt that Peter's Stark-made suits gave him too many convenient powers in ''Film/SpiderManHomecoming'' may be pleased that, despite getting the Iron Spider suit, Peter's webslinging powers are still at the forefront. In fact, the only extra ability here is the mechanical spider legs that only show up about three times.

** Long before their daughter is born, Tony discusses a dream he had with Pepper about having a dream about having a boy named Morgan, which Pepper dismisses. With ''Film/DoctorStrangeInTheMultiverseOfMadness revealing that dreams are actually a connection one makes to an alternate universe, this indicates that there really is a universe where Morgan was born male.

** The movie fixes the continuity issue that was caused by ''Film/SpiderManHomecoming'', with Tony mentioning it's been 6 years since ''[[Film/TheAvengers2012 The Avengers]]'', falling in line with the 2012 date given by other MCU films and series.

* MoralEventHorizon: If his previous atrocities such as his abusive treatment of Nebula weren't enough, Thanos shows the audience that he is already beyond the line by massacring the last remaining Asgardians onscreen[[note]]though, dialogue confirms half of them are still alive, and Valkyrie is shown rehabilitating survivors after the TimeSkip in the next film.[[/note]], and the Xandarians and Dwarves offscreen in search for the Stones and ultimately culminating in murdering ''numberless'' of beings across the Universe, proving once and for all why he is the Mad Titan. And if none of ''that'' does it for you, try Thanos throwing Gamora, the one person he truly loved, to her death for the sake of power. [[MyGodWhatHaveIDone Even he knows there's no going back after that.]]

* [[AuthorsSavingThrow/AvengersInfinityWar Author's Saving Throw]]

** Peter Parker telling Quill that ''Film/{{Footloose}}'' is not a great movie. One interpretation is that he has seen the original film and did not enjoy it as much as Quill did. The other is that Peter, being born in the 2000s, believed Quill was referring to the divisive 2011 remake of the film and was not aware of the 80s version. Though the latter interpretation seems unlikely given Peter's own movie references tend to be 80s films (''Film/TheEmpireStrikesBack'', ''Film/FerrisBuellersDayOff'', ''Film/{{Aliens}}'').

%% Unfortunate Implications: The number of minority characters Thanos killed off had been deemed not an example [[https://tvtropes.org/pmwiki/remarks.php?trope=YMMV.AvengersInfinityWar here]].

** Thanos already had this reputation among comic fans, but the massive wide success of this movie [[UpToEleven kicked it into high gear]], no doubt due to not only his incredible fighting prowess but to [[TheBadGuyWins actually winning.]] It's gotten to the point that "Thanos" has become synonymous with "InvincibleVillain" among casual audiences and comic fans alike.

* UncannyValley:
** Invoked. The cybernetic eye Rocket gives to Thor looks somewhat off in several shots.
** In general, the mo-cap for the Children of Thanos isn't as polished as what was done for the Mad Titan himself, and has a few moments that look ''off''. Carrie Coon's Proxima Midnight is, for the most part, a phenomenally seamless mo-cap performance, but in the exchange with the heroes at the Wakandan barrier, the close-ups certainly fall into this during her speaking lines.

** Wanda and Vision's conversation before Corvus Glaive and Proxima Midnight ambush them in Scotland become this when you realize [[spoiler:[[Series/WandaVision Vision was about to tell Wanda about the property he'd bought for them in Westview]]]].

%% does not necessarily count as Funny Aneurysm Moment/Harsher In Hindsight/Hilarious In Hindsight. Thanks.

* FanNickname:
** [[VideoGame/MetalGearSolidVThePhantomPain "Punished Cap"]] for Captain America.
** "The Snappening" or "the Snapture" for Thanos's BadassFingersnap and the resulting casualties.
** Alternatively, just simply "The Snap" is common.

** Corvus Glaive and Proxima Midnight were stated by their actors to be married to each other similar to their comic book counterpart. This was not mentioned in the film ([[AllThereInTheScript along with their names, only in the credits]]) and them being killed off prevented any kind of development.

** Fans who wished to see [[EnemyMine Loki team up with the Avengers]] were disappointed when he was killed off before reaching Earth or even having any interaction with any of the other Avengers (besides Thor and Hulk, of course).
** Having Banner meet up with the rest of the Avengers mere ''seconds'' after Ross leaves feels like a serious waste given that they're [[ArchEnemy arch-enemies]] who haven't met onscreen in [[Film/TheIncredibleHulk2008 literally a decade]].

%% UnfortunateImplications: The number of minority characters Thanos killed off had been deemed not an example [[https://tvtropes.org/pmwiki/remarks.php?trope=YMMV.AvengersInfinityWar here]].

** Thanos fits the tall and muscular {{hunk}}y mold, which shows in [[SleevesAreForWimps his clothes of choice]]. He also has a deep, husky voice that sounds very commanding.

*** Tony and Stephen repeatedly save each other from dangerous situations -- [[spoiler: Tony helping get rid of Maw while he was torturing Stephen, and later Stephen protects him and Peter when the ship crashes.]]

** Thanos’s justification for his culling of half the Earth’s population seems utterly insane to most people, with most people both in and out of universe claiming that his supposed fears of an overpopulation crisis are merely a selfish excuse for him to commit genocide on a universal scale. Then ''Film/{{Eternals}}'' reveals that [[spoiler:the Celestials were planning to use Earth’s massive population to cause the Emergence, which would’ve allowed a new Celestial to be born at the expense of the entire planet being completely destroyed. This means Thanos' Snap actually delayed the Emergence, and gave humanity five extra years to live before the Avengers undid his work in ''Film/AvengersEndgame''.]]

** Having Banner meet up with the rest of the Avengers mere ''seconds'' after Ross leaves feels like a serious waste given that they're [[ArchEnemy arch-enemies]] who haven't met onscreen in [[Film/TheIncredibleHulk literally a decade]].

* FunnyAneurysmMoment:

* HarsherInHindsight:

* {{Narm}}: See [[Narm/MarvelCinematicUniverse here]].

* WhatAnIdiot:
** Earth is being attacked by aliens, again, and both Vision and Iron Man are MIA. Sec. Ross is videoconferencing with Col. Rhodes (the last Avenger around) when Cpt. Rogers and several other former heroes on the run due largely to administrative disputes show up along with a damaged Vision in Rhodes's office. Cpt. Rogers tells Ross that he's not looking for forgiveness, but he's going to fight the aliens and Ross can either stay out of the way or fight them. Col. Rhodes also points out that while he signed the Accords, he's slowly coming to disagree with them after battle damage paralyzed him and especially in light of the fact they caused the Avengers to become divided.\\
'''You'd Expect:''' At absolute worst, a fair bit of posturing. Demand of information and cooperation in exchange for a pass on shenanigans to date or perhaps a head start once the current mess is dealt with. This would reflect poorly on Ross from an objective viewpoint, but at least indicate a grasp of the bigger priorities.\\
'''Instead:''' Ross orders Rhodes (who, even if he wasn't on the verge of a BrokenPedestal, is out of his armor, outnumbered, and can only walk with difficulty) to arrest the lot immediately.\\
'''The Result:''' Rhodes, realizing that [[SkewedPriorities Ross has allowed his hatred of superheroes to cloud his judgment]], quite predictably hangs up in the man's face and [[ScrewTheRulesImDoingWhatsRight goes rogue]].
** The Guardians of the Galaxy have teamed up with Thor to stop Thanos before he can obtain all the Infinity Stones. They plan to split into two groups; Thor and two others will go to Nidavellir to obtain a weapon capable of killing Thanos, while the other three will go to Knowhere to get the Reality Stone from the Collector before Thanos can. Gamora meanwhile knows the location of the Soul Stone, and realizes that Thanos will want to question her about it.\\
'''You'd Expect:''' Gamora to join the group heading to Nidavellir, a place where Thanos has no reason to go. If he's not in the same place as her, he can't get the stone's location from her.\\
'''Instead:''' She joins Quill and the others to Knowhere, which puts her at risk at being kidnapped by Thanos, seemingly because she wanted to kill Thanos personally to atone for the crimes she committed as his daughter, and to avenge the abuse that she and Nebula suffered as children.\\
'''Result:''' Thanos leads the group into a trap and captures Gamora, and forces her to lead him to the Soul Stone's location by torturing a captured Nebula, and then he [[spoiler: throws her off a cliff]] in order to obtain the stone.
** This ends up going full circle further down the line; Quill soon learns about [[spoiler: Gamora's death]] while Thanos is in a trance thanks to Mantis, with Dr. Strange, Iron Man, Spider-Man, and Drax trying to get the Infinity Gauntlet out of Thanos's clutches.\\
'''You'd Expect:''' For Quill to wait until the gauntlet is off of Thanos to unleash his wrath. That way, Thanos would be powerless to stop him and everything can be back to normal.\\
'''Instead:''' He punches Thanos in the face, therefore breaking him out of Mantis's trance.\\
'''Result:''' Just as the Infinity Gauntlet is about to slip out of Thanos' hand, he snaps back to reality and narrowly manages to foil the heroes' attempt, thereby allowing Thanos to beat the group, take the Time Stone from Strange, and leave, leading to the example below.
** At the film's climax, Thanos has just assembled all of the Infinity Stones and inserted them into his gauntlet, when Thor suddenly appears and buries his axe deep into Thanos' chest, leaving him critically wounded, but still alive.\\
'''You'd Expect''': Thor to immediately withdraw the axe while Thanos is reeling from his wound, then decapitate him and end the threat once and for all, or use the axe to bludgeon him repeatedly, or amputate his left arm so he can't use the gauntlet. Or even just to shock him to death with lightning.\\
'''Instead''': He stands over Thanos, [[TheReasonYouSuckSpeech gloating]] about having gotten revenge for Thanos's murdering half of the surviving Asgardians.\\
'''Result:''' Thanos proceeds to grin, [[LampshadeHanging lampshades]] this trope through the infamous line "you should have gone for the head," and then use the Infinity Gauntlet to ''obliterate half the population of the universe'', Winter Soldier, Black Panther, Falcon, Scarlet Witch, Star Lord, Drax, Groot, Mantis, Dr. Strange, Spider-Man, Nick Fury, Maria Hill, [[spoiler: [[WordOfGod Betty Ross, Sif]], [[Film/AntManAndTheWasp Hank Pym, Hope van Dyne, Wasp]], [[Film/AvengersEndgame Hawkeye's entire family, Shuri]], [[Film/SpiderManFarFromHome May Parker, MJ, Ned Leeds]], [[Series/WandaVision Monica Rambeau]] and [[Series/Hawkeye2021 Yelena Belova]] included. [[Film/AvengersEndgame Thor gets PTSD from guilt, and ends up becoming a fat, layabout shlub who drowns his regrets in beer and junk food]]]].

'''Result:''' Thanos proceeds to grin, [[LampshadeHanging lampshades]] this trope through the infamous line "you should have gone for the head," and then use the Infinity Gauntlet to ''obliterate half the population of the universe'', Winter Soldier, Black Panther, Falcon, Scarlet Witch, Star Lord, Drax, Groot, Mantis, Dr. Strange, Spider-Man, Nick Fury, Maria Hill, [[spoiler: [[WordOfGod Betty Ross, Sif]], [[Film/AntManAndTheWasp Hank Pym, Hope van Dyne, Wasp]], [[Film/AvengersEndgame Hawkeye's entire family, Shuri]], [[Film/SpiderManFarFromHome May Parker, MJ, Ned Leeds]], and [[Series/WandaVision Monica Rambeau]] included. [[Film/AvengersEndgame Thor gets PTSD from guilt, and ends up becoming a fat, layabout shlub who drowns his regrets in beer and junk food]]]].

** The leadup to the the Wakanda battle has some very shaky visual effects in places. The green screen effects are very noticeable but Bruce in the Hulkbuster armor stands out as looking very fake and photoshopped in.

** Tony's line ''"Wong, you're invited to my wedding!"'' becomes this when it was revealed that the codename for [[spoiler:Tony Stark's funeral scene]] in ''Film/AvengersEndgame'' was ''"The Wedding"''. [[spoiler:So Tony is essentially inviting Wong to his own funeral!]]

** Creator/ChrisEvans' bearded look has drawn a lot of attention, with many noting the BeardOfSorrow trope fails to signify its intent on account of how much it suits him. Quite a few fans are actually disappointed he ''won't'' have it in the sequel.

* ItWasHisSled: Thanos [[TheBadGuyWins wins]], [[DownerEnding the heroes lose horribly]], and Thanos succeeds in wiping out half of all life on the universe. In other words, a similar event to the original comic book storyline. In addition to being an adaptation of a famous story, a plethora a memes related to dusting away shortly after the film came out meant that eventually even non-comic book fans knew exactly how the film would end

** Thanos's logic for culling half of all life in the universe has been criticized for being a gross misunderstanding of how overpopulation works. The movie could have recitified that by having the heroes counter Thanos's logic, only for Thanos himself to be stubborn and in willing disbelief of what they say to him, having fully subscribed to his own ideals.

* ItWasHisSled: Thanos [[TheBadGuyWins wins]], [[DownerEnding the heroes lose horribly]], and Thanos succeeds in wiping out half of all life on the universe. In other words, a similar event to the original comic book storyline.