How we used to deal with fast food Karens.
Back in the times of yore, long before we knew to call them Karen, they existed. 25+ years ago I worked at a fast food joint that had a faster than the speed of sound name, the servers wore roller skates. My job was kind of like an assistant manager, but more of a jack of all trades in the kitchen area. Most of the people that worked there were high school kids, anyone above the age of 20 was basically in charge. We had our fair share of the normal entitlement, the refunds on eaten food, the pretending they ordered something they didn’t, then wanting freebies. I really was not concerned with getting fired, as I just did that job for beer and video game money, so I was ruthless with these people. As soon as they find out they are not getting their refund, and their “let me talk to the manager/corporate” demands have zero effect, they just stop trying that shit.
Sometimes though we would get someone that would upset one of the girls taking orders. That was my time to shine. See this particular joint had this curiously strong mustard. I’m not sure why it was like that, or if it still is, but back then this stuff was MUSTARDY in the extreme. If I saw one of the girls crying I would take over making that order. Regardless of what burger they ordered, what they got was what I referred to as “the mc mustard” I’d slather it up so thick it was not something anyone in their right mind would want. Often it would get sent back, I would promptly slather it up on the outside of the bun, wrap it back up and send it out to them. Only once did someone ever send it back that second time. In that instance I promptly coated the outer wrapping with mustard, put a second wrapper on it and sent it back to them with a couple good shots of mustard straight into the bag with the rest of their order. That was the last I heard of it.
Our town also had this dude that would call in to different restaurants and claim to have been there earlier in the day, and that the food was wrong. A lot of places would just offer to replace it no questions asked. Not me, I knew his game, and really enjoyed demanding receipts that never existed.