You should have them meet my nephew....that would change their perspective
4 years old the Kid stood up in the middle of pre-school class and announced "Do NOT listen to the teacher, she doesn't know what she is talking about"
personally I love the kid....I think he's friggin awesome...but my Bro-in-law says he gets a call almost weekly.
When he was 2 he took a bag of Candy and my BIL's Van keys and locked himself inside the Van so he could eat the whole bag while my BIL kept pleading w/ him to open the door.....once he finished the bag he unlocked the door and took his punishment like a man...