In general I would say that both my kids are well behaved, the first is an angel, probably kicked off in public two or three times in her entire life. The second is good for the most part, but she is firmly in her terrible twos (which she started at about 12 months old) and is on occasion the closest thing to pure evil you will find outside of a comic book. While 99% of the time she is fine, when she decides to kick off she gos for it. If you were to catch me at the wrong moment in a supermarket you might think I'm letting her run wild when in reality I'm at my wits-end trying to think of any way I can to get her to behave like a human being.
I can shout at her, I can take her toys away, I can reason with her, I can attempt to bribe her, I can even let her do the very thing I was trying to stop her doing when it all kicked off and she still won't be happy. At times I think the only thing that will satisfy her is if I perform some kind of demonic sacrifice at her altar of evil. My ex-wife does not believe in smacking children for the most part (when they're older, can understand what they have done wrong and exactly why they're getting a smack things are different) which means I need to follow suit. So if you ever see me in Tesco with a satanic child screaming and shouting and spewing hate - I'm not letting her get away with it, I've just tried everything apart from picking her up and shaking her really really hard.
I can shout at her, I can take her toys away, I can reason with her, I can attempt to bribe her, I can even let her do the very thing I was trying to stop her doing when it all kicked off and she still won't be happy. At times I think the only thing that will satisfy her is if I perform some kind of demonic sacrifice at her altar of evil. My ex-wife does not believe in smacking children for the most part (when they're older, can understand what they have done wrong and exactly why they're getting a smack things are different) which means I need to follow suit. So if you ever see me in Tesco with a satanic child screaming and shouting and spewing hate - I'm not letting her get away with it, I've just tried everything apart from picking her up and shaking her really really hard.
Young children's behaviour isn't that predictable though! 
