My grandson is 9 months old and I've never seen such a small child exhibit such anger before. Raised three children myself and didn't see an attempt to show anger until much older.
If you are trying to get him to do anything he doesn't want to do, sometimes he pulls his hands into fists, scrunches up his face, tightens his whole body and growls. (Sort of a growling noise,, he doesn't talk yet, so I guess it is his attempt to let us know he is angry. We are unsure how to handle it in one so young. My daughter tells him no,,, but I'm not sure he understands this. We could ignore him, but not sure that is good either. If he is showing this much anger at this age, I sure want to nip in the bud. By the way,,, we gave him an empty pepsi can last night to play with and he actually partially crushed it,,, using the same technique he uses when he is angry.
My daughter has a very bad temper,,, could he have picked it up from her? And what do we do about it?
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