I remember being a bumper for two kids having a shopping cart race. One of them hit me smack in the rear, and kept going without saying sorry! I love kids, but... $@!$&^*(&~
The store I worked in a few years ago, had a play center that you could sign your kids into. They had employees that watched the kids. The play area was locked so only authorized employees could enter, and the parents had to get their ID photocopied when leaving their children. The child could only be turned over to the parent who had placed them in the play center. The mom's loved it.