Plotting an ultimate prank on her teacher for April Fools' Day, Judy Moody begins to worry that her teacher and classmates have forgotten that the first of April is also her birthday.

Nancy, George, and Bess have been invited to an April Fool's Day party at their new schoolmate's house, with each guest bringing a gag to the party and the best prank winning a special prize. When two of the guests' fancy new electronics go missing, Nancy knows it's no joke, and the Clue Crew are on the case to find the missing gadgets.

Grandma, Grandpa, and the grandkids enjoy April Fools' Day on the farm.

It is April Fool's Day, but Max needs to learn that not all pranks are funny.

April Fools' Day is not a happy one for Wagner the mouse because his best friend, Pearl the rabbit, and other children and adults at school keep tricking him.

When Sheep finds out that it is April Fools' Day, he plays jokes on Rooster, Dog, Pig, and Cow, before Horse plays a trick on Sheep.

Harry, his little sister Emily, and their parents all play tricks on each other for April Fools' Day.

Troublemaking twins Kasey and Kelly are excited for April Fool's Day, and plan to pull a "twin switcheroo" on their classmates to see if anyone notices the difference.

The Dixon twins try to discover who put the snake in the school cafeteria flour bin on April Fool's Day, clearing an unjustly suspected classmate in the process.

Explains the customs and traditions connected with the merry pranks of April fooling, and provides several versions of how April Fools' Day came about.