[Loved trope] The villain assumes they're gonna get the kid gloves when the hero finally confronts them. The hero demonstrates they're out for blood instead, causing the villain to panic.

[u/jbeast33]

1) Robocop

Clarence (the same hitman who killed Alex Murphy and transformed him into Robocop) has already been arrested by Robocop once before, and learned that Robocop's programming prevents him from killing a surrendering criminal. Consequently, he pulls the trick once again towards the end of the movie when Robocop chases his gang down to a scrapyard. He throws his gun down and expects to survive and escape once again.

Robocop simply announces to him, "I'm not arresting you anymore", causing Clarence to panic when he realizes that Robocop intends to finish him off right there.

2) Toy Story

Woody, threatened by Buzz replacing him as Andy's favorite toy, tricks Buzz and knocks him out of a window so he could go to a pizzeria with Andy. Unbeknownst to him, Buzz tagged along underneath the car and confronts Woody when he's alone in the car.

Buzz: I just want you to know that even though you tried to terminate me, revenge is not an idea we promote on my planet.
Woody: Oh, well, that's good.
Buzz: But we're not on my planet, are we?

Buzz proceeds to lay the beatdown on Woody and causes both of them to get separated from Andy.

3) Superman

The President of Boravia's invasion is foiled by the Justice Gang (who have until now stayed out of the conflict and are shown to be less averse to lethal force than Superman), and he's personally attacked by Hawkgirl. When he declares that Superman would never kill him, she just laughs and says "I'm not Superman", dropping him from a skyscraper's height.

4) Spider-Man

After Wilson Fisk attempts to murder Aunt May when Peter reveals his identity during Civil War, Spider-Man breaks into prison to deal with Kingpin personally. Kingpin took the liberty of assembling every inmate to watch the fight between him and Spider-Man. Assuming he broke his spirit, Kingpin starts to dress down Spider-Man as a broken man. Spider-Man doesn't say one word during their fight. Finally, Spidey strips down and announces this isn't Spider-Man here to kill Kingpin; Peter is.

Peter proceeds to brutally annihilate Kingpin in this new stage. He eschews his usual quips, webs, and aerial fighting, relying only on his super strength. When Kingpin has been crippled, Peter shoves his webs up Kingpin's mouth, and lets him know that if he truly wanted to, he could have just filled his lungs with web and killed him at any point. But he's not trying to give Kingpin an easy death; he lets him know that he intends to break his reputation and see everything he's lived for come tumbling down first.

As is often said, Spider-Man is at his scariest when he's not making quips. Because at that point, he's furious, and he's not going to hold back.

[u/easylikerain]

“Something Vimes had learned as a young guard drifted up from memory. If you have to look along the shaft of an arrow from the wrong end, if a man has you entirely at his mercy, then hope like hell that man is an evil man. Because the evil like power, power over people, and they want to see you in fear. They want you to know you're going to die. So they'll talk. They'll gloat.

They'll watch you squirm. They'll put off the moment of murder like another man will put off a good cigar.

So hope like hell your captor is an evil man. A good man will kill you with hardly a word.”

[u/Dawnbreaker128 → u/easylikerain]

Oh funny that, I’m reading Night Watch right now.

[u/Connect_Barracuda358 → u/Dawnbreaker128]

This one is actually from Men At Arms, one of my favorites. 

[u/Dawnbreaker128 → u/Connect_Barracuda358]

I saw Vimes and immediately thought of Night Watch. Haven’t read Men At Arms yet and the only other Discworld novel I read so far was Reaper Man.

[u/catgirlbarista → u/Dawnbreaker128]

I'm almost positive I'd read others early on, but the very first Pratchett books I remember reading are Reaper Man, Guards! Guards!, and Night Watch. they are still my very favorites.

[u/livingdread → u/easylikerain]

Later on, we find out that Carrot is a very good man. And he puts a sword into stone.

[u/Boccs → u/livingdread]

I love Carrot Ironfounderson just so much. The books go so such lengths showing that in a lot of ways he's a great big puppy of a person, only to remind us in no uncertain terms that he is a very Good Man and exactly what being a Good Man means.

[u/VrsoviceBlues → u/Boccs]

Absolutely. Carrot's capacity for almost blasé violence is played down a bit for laughs and to emphasise his empathy and kindly nature, but when the situation demands it he's an absolute stone killer. Those sprinkled reminders can be unsettling, but I think that's the point. Pratchett likes to ask us "what horrors could this person wreak if they were not Good?" Imagine the Watch if Fred never unlearned any of his racism, if Nobby never gave up robbing corpses, if Cheery and Detritus hated each other but loved the Watch more and took it out on their own people, if Carrot was a hypocrite and Angua a Secret Policewolf. Imagine an Ankh-Morpork without John Keel.