I've been yelled at for things that aren't even "mistakes", just the FES being petty.
Like when I open up a register because Que Vision demands it. "You're a bagger today!" Even though they have enough baggers, and 99% of the time I run the register during my so-called "Courtesy Clerk" shifts, since I was hired as a cashier anyway.
Or when I ask when my break or lunch is even when they're clearly an hour late (I don't ask during the rush)
This particular FES is also the ACSM (for now anyway) and they're generally miserable and unpleasant.
The other FESes are pretty cool people if a little too lenient.
They yell at me for taking long breaks. I think I am entitled for a thirty minute break for all the rubbish I go through while working at Fuel Center. When they yell at me, I yell back at them and tell them how crappy the job is. Eventually they shut up and resign to the fact that I take long breaks. It never goes to management. They think they're management so I love putting them in their place as they are not in charge of Fuel Center.