Some children do experience the "terrible twos." What the child is learning, no matter when disordered or not, is how YOU react. What is important, and you might already be doing this, is in addition to either ignoring the bad behavior (or better yet, placing the child in a different room from you and company, or leaving the area so there's no audience), but rewarding good behavior.

It might take a little more effort, but it's well worth it. When he gets the idea that "Hey, I'm just sitting here playing quietly (lol does a two year do that???) and here comes mom with a hug and a new idea! That's great!"

Even a two year old will get the picture: " I get more attention, and I like it, when I am good, than when I'm angry and mean."

Consistency, as you probably also know, is the key. Remember, 21 times of correctness to replace incorrectness... good wishes!