Office Crossbow With Trigger

this is my first i'ble so be nice plz :)

first, sorry for the pics not being clear but i used my ipod:)second, this is a crossbow you could build with stuff that might be in the office so you might, well, you know, build it in the office BUT DO NOT HURT PEOPLE, thank you, have a nice day.

Step 1 The supplies

for this instructable  you will need:

a contracter's pencil (i dont know if thats the right name but its those funny shaped ones you sharpen with a knife and find at Home Depot or Lowe's)
a Papermate mechanical pencil
a rubber band
tape
super glue
a flathead screwdriver

for the ammo:
paper
tape
paperclips
a way to cut paperclips