Jack to Jack - Jack to Jack is a person who's sweet and nice until someone

Jack to Jack is a person who's sweet and nice until someone messes with them. Like Baby JackJack from The Incredibles.

I was nice until you made me angry. I'm a JackJack.

I was a good kid until you pushed me. I'm a JackJack.

I was calm until you messed with me. I'm a JackJack.