Actually screaming and running into people.
I had an interesting 'conversation' with a woman when i muttered for someone to stop them screaming and running around. This woman, who didn't actually have anything to do with the kids, who were roughly 4 and 2, told me they were only playing.
I told her it was a very busy supermarket and they shouldn't be playing here
She then muttered about some people having to take their children shopping. I told her I had had to take all of mine (6 under 8) and no they were't ever allowed to run round screaming whilst I ignored them.
Wtf is wrong with people?