From my military days, about 30+ years ago now. I wasn’t seeking revenge, it just worked out that way.
I was young, early in my career, an E-3 (Lance Corporal) in the Marines. I’d just checked into a new unit, transferring from ANGLICO to artillery and it was my very first day there, and we were loading up to head out to the field for a while. My section chief was a loud-mouthed Sergeant who liked to yell a lot, liked to hear the sound of his ‘command voice’ booming out orders to us left and right.
Trouble is, we didn’t need orders, we knew what needed to be done and we were doing it, post-haste. He just liked to hear himself yell. Made himself feel important. For purposes of this story, let’s call him Sgt. YellsAlot. I remember his real name, first name too, but I won’t say it in the clear (but it was HQ 1/14 in the early 1980s - do you remember this night, [John M](Sgt. John Morsehead)? I bet you do).
I was in the Survey section back then, and there was this huge survey chest, about as big as a coffin and pretty heavy, about 300 pounds. I was strong in my younger days, and being new and a young hard-charger, wanted to impress my new mates. So me and this other guy, a large Marine himself, we both pick it up, he at one end and me at the other. It’s heavy, but we’re managing it. Others are asking if we need help, but we tell them we’re okay. But it’s heavy.
We’re carrying this heavy chest, and Sgt. YellsAlot is barking orders all over the place. But you could tell his brain was getting overloaded because there was a lot more going on than his brain housing group could process. You could hear it in his starting-to-quiver voice. Standing nearby him, carrying the heavy survey chest and already tired of his yelling, I asked,
“Sgt. YellsAlot, where do we put this?”
Brain circuits overloaded, you could almost see the smoke coming out of his ears. He didn’t know the answer, and so he barks in the best command voice he could muster,
“Just drop it, Marine!”
Literally - I did. I dropped my end. I just let go. I knew that wasn’t a friendly thing to do to the other guy holding the other end, but he was big, bigger than me, and he could handle it. And besides, I was tired of listening to this blow-hard yell. My end hit the deck, and then the other end followed about a half second later.
Unbeknownst to me, Sgt. YellsAlot’s foot was directly beneath the chest. It landed square on his foot. OUCH.
He could barely walk, he got carted off to the corpsman’s office. I swear I didn’t know his foot was there. About 2 hours later we’re all loaded up, the trucks are ready to go, and we’re standing in formation and waiting to head out. Sgt. YellsAlot shows up on crutches, his foot in a cast - broken. It’ll take 6+ weeks to heal.
After Sgt. YellsAlot hobbles away, someone else in the survey section says to me, “Hey Bullitt (okay, he used my real last name), man I don’t know you but I like you already!”
It turns out I did impress my new mates. 
Like I said, I wasn’t seeking revenge, it just kinda worked out that way. And it was pretty sweet.