If you really want to make sure someone gets a message, just stab a huge machete through the note to hold it up for everyone to properly see. If sharp, dangerous weapons aren't allowed in your office, then you may need to settle for these cool new Medieval Weapon Push Pins. Whenever you need to tack up a note or memo, just go to your office supply armory drawer and select from this set of ten weaponized push pins that include two of each: Sabres, Single Handed Swords, Broadswords, Katanas and Axes. I wouldn't enter into battle with these, but they'll still get the point across.
Medieval Weapon Push Pins