How to Make a pen shooter for office or classroom warfare, for fun

Looking for a fun way of making a nice little concealed pocket shooter for spit balls, q-tips, the whole shebang? Well check out this awesome video on how to convert a G2 ball point pen into a small pen shooter that you can load smaller ammunition into and fire from to annoy someone, or to use as a back up weapon in office warfare when you run out of nerf ammo!