I understand! My 13 month old DAUGHTER we call her brutus! I have had to work at teaching her to not be rough. When she was even just 6-7 months old, if she grabbed your hair or skin on your neck, oh my did it hurt! Now I sternly look her in the face and say "no" and often will swat her on the hand. If she (or my older daughter who is 28 months) throws things AT ALL, they have a consequence. It just is not acceptable. I also saw on super nanny showing the child soft things and saying how nice it is to touch them and then you touch the child softly and they get a connection between the soft way to touch. Maybe explain to him how you feel when he gives you an "owie." Either way, that kind of roughness in my opinion is not acceptable. It will just carry over to his playmates, grandma and grandpa, etc. Be consistant in your consequence and he will get the picture.