It is a parodic holiday, following in the footsteps of International Talk Like a Pirate Day and the Pastafarian holiday, Holiday.
Monsters, Inc. | The Right Stuff | River Monsters | Gods and Monsters | The Wonder Stuff | Percy Jackson: Sea of Monsters | Universal Monsters | Monsters of Rock | Walking with Monsters | The Right Stuff (book) | Monsters University | Famous Monsters of Filmland | Percy Jackson: Sea of Monsters (film) | Destroy All Monsters | Aaahh!!! Real Monsters | The Right Stuff (film) | The Monsters and the Strangerz | Sea Monsters | Moshi Monsters | Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack | Escape from the Planet of the Robot Monsters | Unspoiled Monsters | The Sea of Monsters | Scooby-Doo 2: Monsters Unleashed | Monsters vs. Aliens | Monsters (TV series) | Monsters Inside Me | Monsters | Hot Stuff the Little Devil | Godzilla: Monster of Monsters |