These days, I would have told the man in question exactly what I thought of him.
Not so when I was about 22 and had someone like him behind me at the check-out.
As always at the time (there was no alternative), I had my younger son with me while shopping, aged under a year old at the time. He, obviously, was in the trolley.
Because of lack of space, I ended up with the trolley on the shop side of me, rather than the exit side, as I put its contents on the belt.
The cashier started checking things through before I had them all out, meaning that I then had to rush to start bagging them up as soon as possible.
At some point in all this, I discovered that my trolley was no longer there behind me - Mr Nasty had shifted it, with my baby son still in it, back into the shop.
I was gobsmacked, and he had a real go at me for leaving it in his way!
As my things were still being checked through at that moment, I should have refused to pay or move until my baby was returned. In fact, I should have accused him of abduction and called for the manager. These days I would.
Of course, being young and shy, I didn't - I did tell him that he was being unreasonable, but just got more abuse.
I was so upset that I found it very hard not to cry as I made my way home.
Worse, not one person, not even the cashier, said a word!