I'd just finished the grocery shopping and had my hands full with a trolley, 5 month old DS2 in his carry car seat across the top of the trolley, and almost two year old DS1.
DS1 was going through a tantrum stage and decided to have a major one right there, just by the door to the exit, because I said 'no' to something.
There was nothing I could do, he was thrashing around too much for me to pick him up and put him into the trolley's child seat, so I decided to wait it out until he calmed down, then console him and get us all back to the car.
I was close to tears myself when along came this lovely woman, probably about the age I am now (mid-50s). Without any fuss she offered to push my trolley and baby while I grabbed DS1, and together we went back to my car.
She was so kind, just lovely. Absolutely no judgment whatsoever and I'm quite sure she'd been in my shoes at some time and knew exactly what it can be like with small children. I've never forgotten her kindness.