Dr Evil has a never-ending supply of disposable 'henchmen' in Austin Powers.
Subverted in the deleted scenes as, whenever a wisecracking Austin killed a henchman, the film would immediately cut to the Mook's family or friends learning of his death and mourning him.
That thing was actually played once in the finished version of the original movie, where one of Dr. Evil's mooks gets run over by Austin Powers, after which it cuts to his family and stepson, where the sad news get to them and they all mourn his demise.
Played with and lampshaded by Nigel Powers in Goldmember:
Nigel Powers: Do you know who I am? [henchman nods yes] Have you any idea how many anonymous henchmen I've killed over the years? [henchman nods in the affirmative] And look at you. You haven't even got a name tag. You've got no chance. Why don't you just fall down? Go on, son. [henchman falls to floor]
And maybe, just maybe, the clones, especially if they happen to be serving under Pong Krell.
Spaceballs, where the mooks are actually the titular "Spaceballs".
In the Blaxploitation thriller Three The Hard Way, the heroes take on a bunch of thugs, with nothing stronger than cap pistols, at long range, and never miss, while the thugs, armed with fully automatic machine guns, at point-blank range, can't hit the broad side of a barrel. The bad guys all succumb to the cap pistol assault, and the good guys emerge unscathed except for one of them who has a slight flesh wound.
The Chinese movie Hero has some almost Diablo-like flashback scenes where the heroes mow down enemy soldiers by the scores, if not hundreds.
The most recent Mummy film had an army of (technically) zombie clay soldiers. Which is about as dangerous as that sounds. Just the thing for killing with impunity.
Repo! The Genetic Opera has Gene Cops, employees of Gene Co who are a lot more public and a lot less deadly than the henchgirls and Repo Men but are still enough to scare fifteen scalpel sluts and Grave-Robber into fleeing. Amber Sweet also has her valets.
The dubiously named Crazy 88's were all mooks in Kill Bill which The Bride easily dispatched whilst on her revenge rampage. The trope was played with towards the end of the carnage as she spanks one of them with her sword.
Exactly how many members were there in the Crazy 88's? Did you count them?
A frame-by-frame count performed by Jonathan R. from Bouncing Ferret Films shows 82: 67 killed, 12 maimed, 1 killed by an axe thrown by somebody else, one possibly killed, one spanked and sent home to his mother.
Subverted in Brazil. Sam and Jill make a dramatic escape in her truck from a horde of guards giving chase; at the end their Mookmobile crashes and explodes. Cue the triumphant music, Sam celebrating... then slowly dissolving into horror as the camera shows the guards struggling to escape a horrible, burning death.
Inception has an interesting variant: the Mooks in this case are subconscious projections that populate the dreamworlds created by the lucid dreaming machines. The projections are initially harmless, so long as the dreamer's subconscious believes the dream is reality, but as the subconscious becomes aware that they are in a dream - accelerated by things such as shifting gravity or altered reality - they become more hostile, up until the point where they openly start attacking the "intruders." Certain people also undergo defensive training that "militarizes" the subconscious - which results in projections going from being an angry mob that only assaults when major changes are made to a well-armed, cohesive force of trained soldiers that attack intruders very quickly when a threat is detected. The latter is what composes the majority of the enemies the protagonists fight in the movie.
In the Original The Crazies The Army never take cover and are incredibly easy to shoot because of their white NBC suits.
In The Dark Knight, the Joker has a seemingly unlimited number of mooks. One has to wonder what they're in it for, with a nearly 100 percent mortality rate and their crimes involve no apparent monetary gain.
Additional material seems to indicate that most of them were mentally-ill escapees of Arkham Asylum.
Used with an unusual (and probably realistic) moderation in Drive, where the two villain bosses, in spite of being depicted as very powerful and dangerous, don't really have more than 3-4 mooks on their side.
Yellow Submarine: The Chief Blue Meanie's mooks are quite varied. From little Meanies who look like him except for their Mickey Mouse ears to the Apple Bonkers, Snapping Turtle Turks, Countdown Clowns, Hidden Persuaders, Butterfly Stompers, Max-the-Nippers, and the dreaded Flying Glove.
X-Men: The Last Stand is based around Magneto raising an entire army of mutant mooks. He even lampshades using them as, in the final battle, when he sends his first wave of defenders (who make the classic mook mistake of charging impulsively at the attackers), he calls the defenders "pawns".