Corporal Punishment for Children

Cloud and Frou Frou, my two cats, knocked over my sticker collection (one of them, that is)! I got home from work last week and found out! They aren't supposed to even be up on my art desk in the first place. I shook my finger at them and said, "You have done a very bad thing!" The thing is I didn't yell at them, just spoke in a slightly stern voice. They looked up at me with blank faces. Then they asked for their treats, like business as usual. I gave them their treats after a five second punishment that they also didn't understand. They are good cats but can sometimes be mischievous!