I am at the playground with my 4 year old today and this mom comes in and her son is about 6 and he is running around the playground with an open knife on his swiss army knife. I kept my son away from him to be safe. Meanwhile mom is on her cellphone the whole time while he runs around with this. If you want to give your child an item like that it is your business but no supervision in a place that has other children around that could potentially get hurt bothered me.