A&E about a month ago. L-o-n-g waiting times, kids getting bored and restless - running around, sliding on the floor and getting in the way of the staff.
One of the fathers - a young East European by the sound of his accent, gets up, corrals all the kids including his own two sons, and encourages them to run at him - he then lifts them up over his shoulders (he was a strong looking chap) and slides them down his back. The youngsters started to get a bit loud, so he corralled them again and told them they had to be quiet because there were sick people in the waiting room. They looked around nervously and then continued in what almost became a gymnastic exercise - and they responded to his demand to keep the noise down,because he explained to them (two of the kids started to "shush" the others when they thought they were making too much din)... just the odd giggle / laughter and now and again a slightly loud squeal, but all in all they were letting off steam and not irritating other people (there was a separate area in the waiting room specifically designed for children).
Top marks to the father, he was properly engaging and interacting with the kids, allowing them to burn off their natural energy. Without disturbing others.
He looked exhausted when he finally left with his family - to a round of applause from some of the patients.