I do the same job
This is waaayyy more common than people think
We dread one woman in there,because she will swear up and down the houses she did say she wanted expensive burger (never a cheap one) and that she's not budging until we get her one as it's not in her bag (shouted at us with every swear word going-her young son is always in the back)
Then,when she's told 'no' she will park while blocking both lanes (still swearing) until the police come and they move her
She once came into the store,demanding we replace a cheeseburger for a mccrispy (shed paid for the cheesburger) as 'that thick bitch put a cheeseburger through and I asked for the mccrispy!'
That thick bitch was me,shed asked for a happy meal,cheeseburger and a coffee-her kid ran off upstairs to play on the ipads and after screaming at us for 20 minutes,she finally saw she wasn't getting her free burger (she wanted to keep the cheeseburger and get the mccrispy as 'competition') and turned looking for her son (who was about 4)
She found him,slack jawed in front of the ipad,came stomping down the stairs while screaming at me for not looking after him
She was told that we are a fast food restaurant,not her personal nanny and she is now banned (show up and you will be arrested)
The ban runs out in 3 weeks,wonder if she'll be back?