Terrible Twos?

I am wondering nowadays, who exactly termed the phrase "terrible twos". Kameryn never went through that phase....so I am thinking, someone should have termed it "terrible threes" You know, back in my innocent child rearing days, Gwen approached me and said "You know, they have all this talk about the terrible twos, I think they are wrong, I think it is the threes you have to watch out for. Lydia was never this bad at 2" In my heart of hearts I thought, "oh Gwen, that's sweet but it's probably just Lydia - Kameryn isn't going to go through the terrible 2s or 3s. She is just too mild mannered." (Now, know that I did not think this because I thought Lydia was a bad kid, not at all. It's just that Lydia's and Kameryn's personalities are so different. I just figured that Lydia's terrible 3s were something she would go through, but not Kameryn.)
I was wrong, Gwen was right. The closer Kameryn approaches 3, the closer her behavior can be termed as terrible. She has started in with these little sassy sayings, back talking, purposely doing naughty things, etc. Luckily I am a really patient person and I understand it is just her way of pushing the envelope, finding out where she stands, and getting her little feet underneath her. All in all, she is still our delightfully pleasant, easy tempered, and loving child. But she has started to intermix these little quirks and tantrums into her "personality"
Here are some of my favorites:
If Kameryn doesn't get her way (say I tell her she can't watch cartoons) she blurts out, "Fine, than I'm leaving!"
If you tell Kameryn something to do she will look at you and whisper "no!" (Like by saying it quietly she can be defiant without getting in trouble)
Kameryn likes to demand justice and fairness, take for instance these statements:
"Mommy, you need to say 'thank you Kami Bami' you need to tell me thank you." (Even when I have said thank you, she likes to here it 5 and 6 times)
"Mommy, you shouldn't yell at me. You need to say 'sorry Kameryn'. Because you hurt my feelings." (This one is my all time favorite, because, while she does have a point that I shouldn't yell at her, she always neglects to mention her fault in the matter, the reason I finally did have to raise my voice. In situations like these I always say, "You're right Kami, Mommy shouldn't yell and she's sorry. But you shouldn't ____ and you need to tell mommy you are sorry as well."
Kameryn is also developing all sorts of independence. She is climbing shelves and fridges to get what she wants to eat. She always gets herself dressed in the morning, and she always has to say every prayer; no taking turns in our house. Prayers are apparently her job. If you start saying a prayer, she will take over and either tell you not to help her, or she will speak louder than you so as to drown you out.
Ah, raising a 3 year old. It should be interesting. Especially since Cooper is approaching that "I am so happy all the time, but I am a bundle of mischief and you will have your hands full!" stage.