So here's a story told second hand; a story of my dad's friend's encounter in workplace hell.
We'll call him Bruce. Bruce is a big guy; damn near 7 feet tall. Bruce worked with concrete (he's retired now). Not terribly bulky looking, but he could heft a sack of cement and wander around with it like it's no biggie. Short cropped hair as black as corporate's soul and perpetually tanned/sunburned in a combination that made most onlookers a bit unsure whether there's a legit ethnicity under that odd combination of lobster red and suntanned brown. Very distinct looking fellow.
On one of his many trips to a big box orange store for supplies to his job, he encounters a woman who politely asks him for assistance since she can't seem to track down anyone on the floor for help. He tells her kindly that he doesn't work there, but agrees to help her and advise her on a project she tells him about (I don't remember the project). She grabs her goodies under his direction and advice, notes what needs to be done with what bit or bobble and buys her stuff at the registers.
He does his own purchasing through the company account. (This was decades ago, and such things were in a three ring binder, rather than in a computer.)
All is good, or so it seems.
About a month or so later, a strange man storms onto the current worksite and punches Bruce square in the nose as he's hunched over, shoveling cement. Bam! Out of nowhere, to poor Bruce's point of view. But Bruce, on top of his introductory description above, is the dude that takes the punch and smirks at you. Which is exactly what happened.
Bruce stands up to his full height, looks waaaaayyy down at the puny little mortal, gives the man a smile that would chill the blood of a hardened mafia hit man and says "Son, that was your one freebie."
The fight was short and very much weighted in Bruce's favor. He pounded the man flat, folded him like a towel and put him away, whimpering. He was still folded and whimpering when the police arrived on the scene, took statements, took photos and went about their business.
He find out much later that the woman he helped out of kindness, had escaped from a relationship with a very jealous man. But said jealous man played (skillfully) the part of a husband who suspected his "wife" was cheating on him. Hired investigators with cameras, the whole nine yards. He got several photos of Bruce helping the woman around the store and pulling things down for her, talking and smiling with her. Since he clearly wasn't an employee with the bright orange apron, Bruce was (supposedly) one of the dudes she was 'cheating' with. He got ahold of Bruce's name and with what company he worked, then haunted construction sites until he spotted Bruce and went apeshit on him.
And Bruce, being Bruce, went full on Hulk in return.
In the end, the guy went to jail... after a trip to the hospital with a few missing teeth and several broken bones. Bruce was given a verbal finger wagging, though he was also told off the record told that was the sweetest story they would have the pleasure of sharing over the water cooler at the station.