"If you ever, ever break my orders again... as God as my witness I will devote whatever time I have out of jail to making your lives living Hells. I will break your knees. I will beat up your wives and kids. I will make fun of your mothers and kill your fucking pets in front of your eyes. My wrath will be as extensive as it will be disproportionate, because I have no. Fucking. Sense. Of perspective. Do you idiots hear me?".
At the conclusion of the Mechakara arc in Atop the Fourth Wall, Dr. Insano captures the crippled Mechakara and tortures him with a magnet. Why? The robot made Insano cut his hair.
There's a video floating around of a girl who's supposedly pissed off that her boyfriend plays so many video games, so she takes his Xbox 360 outside and tries to bust it up with a golf club-tries being the operative word, because she has no idea how to swing the thing, so it really amounts more to gentle taps; her initial careless toss to the ground does more damage. Then comes the follow-up video, where the boyfriend objects to her mistreatment of his Xbox, so he takes her laptop and shows her how to really swing, demolishing the computer's screen in one blow.
Ice the Frosty Cat utterly destroyed Ranger in the most humiliating way he possibly could in game 10 of Comic Fury Werewolf... for something Ranger did in Game 6—catch that Ice was a werewolf. Keep in mind, by that point, Ranger had died in game 6, so Ice didn't lose because of Ranger.
In Dragonball Z Abridged when Frieza asks Gohan and Krillin what planet they come from Krillin almost tells him out of fear but Gohan stops him... only for Dendei to do it out of revenge for Krillin constantly calling him Little Green.
In the Whateley Universe, Overclock plotted to cause Tennyo to kill all her friends and be driven insane. Her crime? She ate the last of his favorite cereal in the cafeteria one morning.
The entire premise of Goodbye Kitty subverts this trope.
For the love of all that is pure, do not dent Chris Bucholz's car and neglect to leave a note.
Whateley Universe: Martial arts is one of the standard Physical Education classes at Whateley Academy. Counterpoint (power mimic with awesome powers and centuries of experience as a fighter) spars against Jobe (ordinary baseline powers but a genius with bio-weapons). Jobe wins by fighting dirty, but what happens on the mat stays onthe mat, right? Not with the god of disproportionate retribution, Counterpoint. He pummels Jobe mercilessly. Does Jobe tell the authorities? No, he retaliates with his own disproportionate retribution by dropping a biowarfare weapon in their food. When Counterpoint recovers...
Doctor XX (she pronounces is "Doctor Double-X") from the Global Guardians PBEM Universe is a Mad Scientist supervillain whose only real goal is the complete and utter eradication of all male life on the planet (male humans, male dogs, male chickens, male fish... doesn't matter; if its male, it has to go). Why does she do this? Because she once lived with a man who was a verbally abusive dick.
