I was putting my trolley back in the shelter thingy (what is it called?) in Tesco's car park. I always do this neatly following the Don Humphries' houseparty boarding school hire motto - always leave places tidier than you find them. So sometimes I rearrange a whole load of trolleys so they don't block the parking spaces. Then you get invited back, in the case of the schools, or are just a useful member of society, in a car park.
I was vaguely aware that the bloke who had just placed his trolley had also been neat. As I walked away he turned and said, 'Why is it only the men who do that? The women just shove 'em in anyhow.'
I suggested it was not all men who did it but that it was because the two of us were obviously well brought up and came from north of here (in his case well north). He nodded sagely.
It was a nice moment of contact with a fellow human being both of whom had accidentally discovered the other doing something good without seeking credit.
But is it true? Let's have a MSS sample survey. Do you put your trolley back neatly?