he has me wrapped around his finger

So Dominick has started his hitting stage probably about a month ago but its just recently getting worse up until now we just told him NO! but we decided that now we have to start smacking his hand and say NO! Well, apparently i made him upset when i would smack his hand and he would get the frown face going and start crying, I of course would feel bad and pick him up and apologize but of course at that point is when he would start laughing like haha ive got her right where i want her. Well last night he smacked my face and i smacked his hand his reaction wasnt like it was before he stared at my hand than up at my face than back at my hand and all of a sudden he smacked my hand! I had to turn around because i started laughing but i guess he has figured that out too because than he started laughing. We have a smart one on our hands and we are in for one hell of a ride with this one lol.