TOtally, utterly normal. It is frustration at not being able to do all he wants and say what he wants. It must be infuriating being wee! He is angry at his limitations. Ds used to go nuts at times and he is now aged 2 and a chilled out wee man.
Your other half needs to start reconciling himself to the thought of an angry child now; chances are he will go through angry phases throughout his childhood (look out for the terrible twos, the miserable threes, the starting-school-syndrom, the preteens and pubrty). As others have said, there is a lot of frustration involved in growing up. As long as he is met with love, firmness and good humour he will weather these phases successfully.
My 9 month old has a little stuborn streak. When he crawls near something he shouldn't and I tell him not to (not shouting just a little, no, no, no Tom Tom) he looks at me then if something is behind him he will bang his head on it gently and if there's nothing behind him he sort of jerks. I'm dreading what he'll be like at two!