Nine-year-old Jack is having a very bad day. Everyone is out to get him - Mom, Dad, his sister, his principal, and even his teacher. His only friend is Tommy Jansen. But when Tommy forgets to warn Jack about the giant, gross, gnarly prank he is about to pull in the boys' bathroom, the result for Jack is giant, gross, and gnarly trouble. And it all started with a rat. Then Jack's day goes from bad to worse. Angry and bored, Jack eventually lands in a mysterious store where everything in it is out to get him.