walking a cat in a dog park....very dumb idea... (is the leash supposed to protect the cat? is the leash supposed to signify to the dog that this a a special type of cat that is not to be chased and potentially killed?)
having lunch with lions in their cage...another bad idea.
smashing your head on the cement...another bad idea
Does every obvious situation require a big sign....? geez.
Maybe a dogpark would also be a great place for people to bring their pet hamsters so they can roam around and get a little fresh air, or new born babies.