Outside of a Star Market, I saw an employee in a physical struggle with a guy with a small personal shopping cart. The employee thought he stole stuff; I have no idea if he did.
I stopped partly because the truck in front of my stopped to see what was going to happen and partly so I could call 911 or yell or something if someone was going to get seriously hurt. It fortunately never escalated beyond them trying wrest groceries from each other.
It ended with the shopping cart guy walking away. The employee threw a bag of chips at him. Shopping cart guy turned to me and said, “See that?”
The employee replied, “See what, fucking stealer? Criminal motherfucker!”