!!The film contains examples of:

* AlternativeCharacterInterpretation: Possibly overlapping with FridgeBrilliance; Capone's lawyer, at the end, immediately enters a plea of guilty as soon as the judge orders the bribed jury swapped out for another one. The lawyer does this without Capone's consent which, as noted on this wiki and elsewhere, is grounds for an immediate mistrial in real life. Anyone ever consider that said attorney knew this and pulled the stunt as a Hail Mary to get Capone off once he knew it was otherwise all over?
* SugarWiki/AwesomeMusic: Original score by Music/EnnioMorricone himself.
** Its centerpiece, [[http://www.youtube.com/watch?v=5yc_7MpANQk The Strength of the Righteous]], is instantly recognizable to many, but few remember its origins in this film.
** [[http://www.youtube.com/watch?v=P1aPPsSB6SM Victorious / End Credits]] provides an uplifting contrast to an ominous score / grim film.
** [[http://www.youtube.com/watch?v=xnAVQeXafMA Al Capone's Theme]]. The second half plays during the scene where a jubilant Al Capone gets word that Eliot Ness' sting operation was a fiasco; there's even a very jarring "wah-wah" horn section in it, as if Capone is mocking Ness.
* ClicheStorm: The amount of tropes this film plays remorselessly straight (among other things, TheMentor, NeverHurtAnInnocent, SacrificialLion, ManOfWealthAndTaste, TheSquad, YouHaveFailedMe, BlackAndWhiteMorality, VeryLooselyBasedOnATrueStory, etc) can be rather jarring to to some modern viewers. But seeing how popular the film became in its day, and what a great following it still has, [[TropesAreNotBad it wasn't necessarily a bad thing]].
* CompleteMonster: Frank Nitti is presented as a PsychoForHire for [[BigBad Al Capone]]. Introduced early on as Capone's main enforcer and hitman, Nitti is seen bombing a restaurant with a little girl inside, not caring that she's killed as well. Through the film, Nitti handles Capone's wetwork, ruthlessly murdering anyone in his way with barely disguised relish, [[DissonantSerenity continuing to eat his meal even as the man right next to him is having his brains bashed out by Capone]], slaughtering two policemen on The Untouchables squad and writing "touchable" on the wall in their blood, and later gunning down tough Irish cop Malone. He threatens [[TheHero Elliot Ness's]] family if he won't drop his case. Nitti later tries to rub his own status as untouchable in Ness's face, even taunting him that Malone "died screaming like a stuck Irish Pig," which finally makes even [[KarmicDeath the composed Ness snap]] ([[spoiler:leading Ness to throw Nitti off the roof, with Ness taunting Nitti as he falls screaming to his death]]).
** And of course, Al Capone himself.
* ConsolationAward: A conversation in the film ''Literature/{{Trainspotting}}'' suggests that Connery received the nod for Best Supporting Actor for this reason.
* FridgeBrilliance: Any police officer seen drinking alcohol on-screen during the film gets killed.
* HilariousInHindsight: In this film, Creator/SeanConnery's character frequently says you should NeverBringAKnifeToAGunFight. Not long afterwards, Sean would star in ''Film/IndianaJonesAndTheLastCrusade'' as the father of Franchise/IndianaJones, [[CombatPragmatist a man that always brings a gun to knife fights]].
** Similarly, Austrian-born actor John Banner appeared on this show as a Bavarian brewmeister, who is later confronted by a fellow brewmeister - whose brewery was rushed by the police - to see what he knows about any of it. [[Series/HogansHeroes He knows nussink! NUSSINK!]]
* MemeticMutation: "I want him dead! I want his family.. dead!"
** "You're nothing but a lot of talk and a badge!!"
** The whole "How to get Capone" speech.
** "Somebody messes with me, I gotta mess with him."
* NightmareFuel: [[spoiler: Nitti's smashed corpse lying in the car it fell through. The score doesn't help.]]
* SpecialEffectFailure: Toward the end of the bridge scene, Ness throws a frag grenade at one of the gangsters, which then explodes. Even on a first viewing, it's apparent that the grenade itself does not blow up, but rather a separate charge buried directly behind it.
* TearJerker: [[spoiler: Malone's and Oscar's deaths.]]
** [[spoiler: The little girl who gets blown up at the beginning and the grieving mother who went to Ness afterwards.]]

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