I feel like slapping him really hard, but because he's a total wimp, he flinches and tries to defend himself. Okay, maybe it's because I hit him really hard, but of course it doesn't work like that. So I tell him that I'm going to keep hitting him until he's learnt that he has to keep still when I hit him. It takes him quite a long time and he whines and wriggles. That's fine with me, it just means I can hit him even longer and harder!