This is my favourite memory from working in retail.
Whilst I was in university I took a Xmas temp job working in the food section of a busy department store. Customers could order their turkeys into store and collect them ready in time for Christmas.
I was working the till one day and some guy brings his turkey up to my till to pay. I scan it through and tell him the total and he immediately got angry saying it's more expensive than it was supposed to be. I explained that the price varies due to weight (it was 50p more than the average price) but he was still angry.
Still, he paid and I thought all was sorted until he leant towards me and said "you will be hearing from my solicitor about this".
I just blinked and said ok...
I never found out if he did get his solicitor involved...