It's Gunter's Glorious Day of Discord
The notoriously evil penguin Gunter has created a potion that turns even the most innocent Candy Person into a wily prankster. Now mayhem is erupting all over Ooo, and nobody can stop it This full-color interactive journal is full of fun, harmless pranks to play after school, on vacation, at home, or whenever Gunter's mischievous muse strikes."