I went to a folk festival a couple of years ago and there was a couple of incidents of parent allowing, nay, encouraging kids to play along to the act on percussion instruments. In one case a woman in front of the kid (it was a sit on the floor kind of thing - must have been right in her ear) leant back and asked him to stop. Kid was about 4 and stopped. Kid’s mum taps him on the shoulder and tells him that he doesn’t have to stop . He didn’t start again.
Well done that woman it sounded bloody awful.