I have tried everything. I have tried putting him on the naughty chair for 2 minutes (with a warning),putting him in his cot for ten minutes after he smacked me whilst sitting on the naughty chair, talking to him about the smacking and why it is wrong,and today after a particular bad time I put him in the hallway for about 30 seconds with the door locked. But nothing seems to work. He thinks it's a joke whatever we do. Anyone got any advice?