Who knew a teacher without a body could appear out of nowhere?

Who knew the principal would get really upset about getting his hat knocked off by a snowball?

Who knew there was a special way to ask just to go to the restroom?

Who knew growing wasn't allowed?

Egbert the Chuckling Chicken hadn't mentioned any of these rules. He had just talked about holding hands to cross the street, eating vegetables, and being polite. Stinky, Amy, and Mike Chappel had to learn the hard way if they were to make it through third grade.

The kids in Mr. Thomas' class have a fun year learning about moonlight skates, throwing snowballs, homework, Mr. Mouse, and all the other secret rules of third grade.

Mr. Thomas learns a few things too!