4 year old in our class, very upset that another kid had just informed us all that he was 4, "Teacher, he stole my number!" Very upset.
4 year old girl in our class. Showing us her magic trick with a set of matching game cards. "Pick a card, any card. Now rememberize your card. Now give it back to me. I'm gonna put it in the middle of the deck..." as she is turning her back to whoever's turn it was to pick a card she started by putting it into the middle of the deck and then whipped the card back to the top of the deck. Turn back around, "Is this your card?!"
Yes. Yes it sure is.
My favorite part is that this worked on every other 4 year old.