I love it when the female cashier says "Do you need any help with your packing"
I immediately say "Are you being sexist? Just becuase I am a man, does not mean I am not capable of packing"

That takes em by surprise.

What annoys me, is when I try to put things on the belt in a structured way, making it easy to pack things that are the same into the same bag, the buggers start the belt and don't give you time to organise things properly.

I always start with Drink first, then vegatables, then meat, then .......

However the trolley isn't stacked that way, so it takes time to sectionalise things.

The good till operators allow you to get things organised and then you are ready they start to put things through. I am then at the other end packing and by the time the operator has finished, I am finished. and ready to pay.

If they push things through without waiting, then I take twice as long to pack on purpose and at the end, I say "My wife doesn't like it if I don't pack things properly and I get a bollocking off her."