Recently, in a thread on the subreddit r/movies, redditor u/SecretResort9 asked, "What are the best 'you don’t know who you’re messing with' scenes in movie history?" People really came through with some A+ examples!
So, with that in mind, here are just a few of the most popular responses shared:
Also, due to the nature of this post, there are some SPOILERS AHEAD for the following films!
1. The Matrix (1999)

"Opening scene: 'Your men are already dead...'"
You can watch the scene here:
View this video on YouTube
2. Pulp Fiction (1994)

"The entire final diner robbery sequence."
You can watch the scene here:
View this video on YouTube
3. Taken (2008)

"The phone call. Like, I get chills every time."
You can watch the scene here:
View this video on YouTube
4. Captain America: The Winter Soldier (2014)

"When, like, 10 S.H.I.E.L.D. guys try to subdue Captain America in an elevator and he just beats the shit out of them with one hand. Like, they definitely knew who they were messing with, brought what I think was an adequate amount of men to take him on, but didn’t know he was still a better fighter than them all combined and does it all with his hand stuck to the wall."
You can watch the scene here:
View this video on YouTube
5. Tombstone (1993)

"The scene when Kurt Russell meets Billy Bob Thornton at the saloon."
You can watch the scene here:
View this video on YouTube
6. First Blood (1982)

"When the man who trained Rambo says: 'I don't think you understand. I didn't come to rescue Rambo from you. I came here to rescue you from him.'"
You can watch the scene here:
View this video on YouTube
7. My Cousin Vinny (1992)

"I'm going to go with Marisa Tomei when she gets on the witness stand."
You can watch the scene here:
View this video on YouTube
8. Snatch (2000)

"Brad Pitt's first bare-knuckle boxing scene. I remember just being absolutely shocked by that scene."
You can watch the scene here:
View this video on YouTube
9. The Princess Bride (1987)

"The entire 'I'm not left handed either' fight sequence."
You can watch the scene here:
View this video on YouTube
10. Collateral (2004)

"The alley scene: 'Yo homie, is that my briefcase?' I love that line."
You can watch the scene here:
View this video on YouTube
11. John Wick (2014)

"The scene where the head of the Russian mafia calls the guy who runs the chop shop and asks him why he slapped his son."
You can watch the scene here:
View this video on YouTube
12. Kick-Ass (2010)

"Hit-Girl’s introduction!"
You can watch the scene here:
View this video on YouTube
13. Logan (2017)

"The opening scene when Wolverine fights for the first time."
You can watch the scene here:
View this video on YouTube
14. Black Dynamite (2009)

"The scene when he locks the pool hall door."
You can watch the scene here:
View this video on YouTube
15. Kingsman: The Secret Service (2014)

"If we're bringing up barfights: the first fight scene in the bar. It's often overshadowed by the 'Free Bird' fight, but it is absolutely what sold me on that film."
You can watch the scene here:
View this video on YouTube
16. Star Trek (2009)

"It doesn’t really end badass, but I do love Kirk’s response to those guys at the bar."
You can watch the scene here:
View this video on YouTube
17. Once Upon a Time in Hollywood (2019)

"The climatic scene where the Manson family hippies invade the home and are confronted by Cliff Booth. That dude was high as fuck and he was still in complete control of the situation. I don't think I have seen a more satisfying scene in any movie ever. Especially considering how things played out in real life."
You can watch the scene here:
View this video on YouTube
18. Raiders of the Lost Ark (1981)

"When Indiana Jones waits for the saber-wielding antagonist to show off his fancy moves before shooting him."
You can watch the scene here:
View this video on YouTube
And finally:
19. Pretty Woman (1990)

"In a non-violent way, it's got to be the shopping scene."
You can watch the scene here:
View this video on YouTube
You've read their picks, but now it's your turn. Which scenes did they miss? Share in the comments below!
Some responses have been edited for length and/or clarity. H/T: Reddit.