M.L.
That sounds so familiar. My daughter started doing that when she was 2, going so far as to pretend her tricycle had said 'no' to her...then she would get mad at the tricycle...it would actually end up in a fight (complete with yelling and hitting)...with a tricycle that hadn't said a word.
I think it's pretty normal. My opinion is that my daughter is just pretending...and trying out new emotions...and I'm just grateful that she's experimenting on her stuffed animals, and not on her baby brother. She never hits him (well, not hard anyhow).
Hope that helps!