"Prepare for the Annual Day of the Ninja. Forget 'Talk Like a Pirate' Day. This will truly be our chance to show the world what ninja are made of.
Every year, December 5th is the Day of the Ninja. Plague your co-workers with ninja-ness and wear a ninja mask to work! Got the day off? Run wild in the streets, or dress like a ninja at the mall! Just show the world that YOU ARE NINJA!" I couldn't make this stuff up. Go for it.