I never get my purse out at a checkout until asked to pay because I don't want someone stealing it while I'm busy packing.
I'm neither fast nor slow when packing. Sometimes the bags don't co-operate and I can't get them open in nanoseconds. Sorry.
I pass a few pleasantries with the person at the checkout. I find it brightens my day and I hope it does theirs. Sorry again.
Occasionally I find that because of discounts, I've underspent when I have a £40 or £50 minimum spend Nectar points voucher to use. I will apologise to the server and the person directly behind and scuttle off to the wine aisle for a bottle to cover it. This takes about a minute. The aisle is very close and I know what wine I like. Sorry if that inconveniences you but I will have those points. Take it up with Sainsbury's if their system bothers you.
I will check my change and receipt before moving off. On Sunday, because of a scanning mistake, I was overcharged by nearly £3. If you don't like that, feel free to give me the £3 out of your own pocket and I will move on. Otherwise you'll have to wait the five minutes it took for the checkout man to call a supervisor, reset and rescan and refund me.
I never use the self-service checkouts if I have age-restricted goods because it is too much of a faff. But when I do, I usually use my own bag. I can't put it in the bagging area because even though it's an ordinary cotton bag, it's too heavy. So I scan goods, put them on the shelf, pay and pack. There is no way round this and I am saving the planet and collecting one extra point per own bag used. So I will do it.
Then I check to see I've got everything because I'm fucked if I've paid with a £20 for shopping under £10 and am not going to collect my coin change and check under the scanner for my note.
So sorry, man who was crowding me while I did this and who I told to go away. You were offended by my reaction and took it that I thought you were trying to steal my change. I've no idea whether you were or not. But I wasn't going to give you the opportunity.