Post-It notes are one of the greatest accidents in history. You can use them to remember everything from conference call notes to birthdays to what page you left off on in your book without damaging personal, or business property. Clever Parisians are taking the unassuming note to whole new levels with the Post-It Wars. Reportedly started by an office manager at Ubisoft, workplace warzones are popping up all over Paris as they strive to out Post-It their competition with collages of everything from Spongebob to Mario to Ghostbusters. Outside of an all-out Nerf war, it’s probably the most fun you can have at the office.