The classic classroom weapon with a twist!
Step 1: Supplies
Step 2: Balls
Pull a piece of paper off and make it into a ball. It should be able to fit inside the pen easily. Put it in your mouth and soak it in spit.
Step 3: Pull Apart
Pull apart the pen
Step 4: Load It
Put the spotty ball into the pen shaft
Step 5: Fire!
Blow as hard as you can on the unclogged side