Mole's best friend, the Lumpy-Bumpy Thing, has found a hat. On it there's a label that reads "Warning! Do not touch!" The Lumpy-Bumpy Thing picks up the hat and puts it on his head. But Mole is worried. "Quick! Take it off!," he cries. "It could be dangerous!" Suddenly, a bunny hops out of the hat, and then another, and another. Soon there are too many bunnies to count. What can Mole and the Lumpy-Bumpy Thing do now?