The post about dogs reminded me about something that is a real pain in the neck in my local park - kids on mopeds. They take them round the footpaths and are a total nuisance. In fact I would quite welcome the sight of a big dog jumping up at them.
Plus one Saturday morning I was out and there was a 30something man on a fully fledged motorbike doing wheelies across the grass.
I'm getting very tempted to take photos of the number plates with my mobile and call the police - who are of course never around when you want them... (But a bit worried that I will end up with a brick through my window if I do that.)