My DS was an absolute gem while he was two. Still exploring his boundaries but definitely a well behaved two year old. I was beginning to think there was something wrong with him because he was such an angel all the time.
3 so far has absolutely been the most frustrating with "NO!" all the time, temper tantrums, and refusing to do what he's asked no matter how nicely.
Ahh well, that's what we get *chuckle*.