I worked in a small town Dairy Queen in High School.
Sunday night was the worst shift and everyone hated it. We closed at 10 on Sunday nights. Pentecostal church let out around 9:30-9:45.
The entire congregation would come in at ten minutes to 10 and order everything you could think of. We were required to do pre-closing stuff by our boss even though we knew they'd be in.
So a clean grill was fired up again. No pre cooked burgers ready so they took a bit longer. Clean blizzard/shake makers were again soiled. Clean trays as well.
They would all file in and order a ton of stuff and then get pissed because it was taking so long (5 mins for a burger instead of 3). The manager would explain every time that the delay was because they came in ten minutes before we closed.
Still they continued to be pissed every week.
Then, they would sit in the dining room and just shoot the shit for around an hour. Not eating, not ordering food, just hanging out while we were supposed to be closed. It was so maddening.
After about a year of this, I started giving them fifteen minutes to eat. Then, I'd make a REALLY strong ammonia cleaning solution. Like way more than necessary to make it effective. Then I'd clean every surface they were not directly touching.
They would quickly get the hint.
It was fucking ridiculous. Fucking Sunday night Pentecostals.