Scenario: you sit down and a cat comes up and settles on your knee. One of the other cats comes up to say hello, reaches up and puts her claws in your leg in greeting, you disentangle her claws and the cat on your knee jumps off. Do you A, put up with it and try and get the comfy cat back, B, shout Stop! Loudly at the second cat? Or C, buy kevlar shin pads to avoid puncture wounds?