God do I hate customers who reckon they know the job better than you.
I actually hate customers who say well you used to do that, the girl last week did it for me. NO she didn't so you can quit bare face lying.
Example: Working at boots, You CANNOT part pay points off your advantage card and cash. Say you wanted to buy something for a tenner and you have 900 points on your advantage card, you can't give me a pound and that's cool. I don't know where customers get this idea that they can do this, it's never been allowed as far as I know, it was never allowed when I was there and it's not allowed now. Then you will get some customer saying well they do it at X branch or a girl did it in this store last weekend. I'd always want to say to them STOP LYING! I don't think you can physically do it on the till either even if you were allowed.
Some customers have such a cheek. I don't know how the think it's ok to behave in such ways. Shouting and screaming gets you what you want? No it will just get you banned from the store.
Oh and another thing, please teach your children that it's not acceptable to pull things off the shelves, rip things open or sliver all over toys then put them back on the shelves.
I remember one women let her kid hold on to an iggle piggle teddy all round the store. She came to the till with other things and at the end I said I need to take the teddy over the counter just for a second so I can quickly scan the price. She said oh no we're not buying it I just let her have a hold of it to keep her quiet. She hands me this teddy back covered in slivers and crumbs, I was so disgusted. I felt like giving her in trouble, how would she like to buy a toy for her child that another child has pawed all over, slivered and put germs all over it. Disgusting.