When I was a kid our cat actually attacked a man who was snooping around outside our house one night. I watched it from the window. I saw this strange person in our garden trying to get into the shed when our lazy couch potato of a cat dropped, screeching and spitting, off the garden wall and onto his shoulders. The guy shrieked and ran for it. The cat padded off, licked its paws a few times and went right back to doing pretty much nothing for the next 10 years.