There's a hollowed-out bush in our local children's playground that children use as a little den to play in. That's what I thought it was used for anyway.
Most times when I visit the playground (several times a week) I've seen parents allowing their children to use it as a toilet. It's not just the occasional potty-training toddler who is obviously desperate to go; I've seen/heard older children (perhaps aged 5 or 6) saying to their parents "I'm just going to go to the toilet now..." and head off over to the bushes.
I know I'm not the only parent to find this pretty disgusting - I've heard other parents warning their children not to go in the bushes as other children use it as a toilet. Surely once children are old enough to use a toilet properly they should be told that there are appropriate and inappropriate places to go??