As an excuse to NOT look after their children?
Example. This morning, my 13 month old got his fingers jammed in a door of a pretend horse cox thing at the local play centre by a child about 4 years old. I ran straight over but in the seconds it took me to get there he started screaming as the other kid was holding it shut on his fingers.
I've then realised who his mum was and she was sat reading a magazine.
Yes, use it as some chill time for yourself, but WATCH you child surely!!!!! (It's a small, one big room old warehouse type place)