!!The film contains examples of:

* 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, 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]].
* 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.
* 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.]]
* 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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