This probably won't do any damage, it's just meant to annoy people, but anyway...
DISCLAMER: I am not responsible for any injury or damage caused by this to yourself or other people. I am also not responsible for any trouble that you get in with any parents, faculty members, co-workers, bosses, or any other people covered under loco parentis or have authority over you. I am not responsible for anything that is caused by this. HAHAHAHAHAHA! Beware!
And remember, do not fire at face or eyes.
Step 1: Materials
-A 0.7 mm mechanical pencil (preferably with 2 prongs to push out lead.)
-scissors and or pliers