This is a WARNING. Do NOT under ANY CIRCUMSTANCES point this at anybody or any living creature. It's a very strong little pen shooter, and can leave more than a mark. I am not going to held accountable for your actions, so if you are not mature enough to handle this carefully... turn away NOW.
Now for the good stuff :)
This is a fun and easy (and cheap) little toy that I invented the other day. It's very strong and shoots very far.
What you'll need:
1 Office Depot Ballpoint pen - very cheap -- 1 dozen for $0.89
(this might work with other pens, but I haven't tried)
1 Rubber band of medium length
Step 1: Making the Barrel
Pull the writing end and the little plug on the back of the pen off.
This is a very easy step, if you can't figure it out, you LOSE. Please try again.
Step 2: Placing the Rubberband
The ideal way to place the rubberband is have it crossed accross the pen (as shown).
You want to make sure that the rubberband lies only about an inch and a half past the firing end when it is fully stretched.
*Note* The firing end is the end opposite the side you write with.
It's the one with the wider hole.
Step 3: Securing the Rubberband
Use the string to tightly wrap around the rubberband.
How much string you use and where you place it will affect how your rubberband stretches.
Tie the string off at the end so it won't come loose.
Step 4: Loading the Ammo
Use the ink cartridge as the ammo.
Insert it into the wide hole of the barrel so that the pointy end goes in last.
Let it slide all the way to the bottom.
If you are using an Office Depot pen, the ink cartridge will fit in there very nicely.
Step 5: Firing
Grab the rubberband and the bottom of the ink cartridge, pull straight back, and release.
*Note* If you pull too tight, the ink cartridge might:
a) break within the pen, thus making a big mess
b) fly too hard and explode as it hits a rigid object, thus making a big mess
If you made this properly, it should fire around 30 feet at least.
Make modifications to your rubberband as needed.
Have fun and be safe :) (OR ELSE!)