Instructables
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This should teach your co-workers who's boss. Spend half an hour making it, then have hours of fun hassling your co-workers or target shooting. Mine shot a pencil eraser about 30 feet easily.

Check out Kiteman's version as well. http://www.instructables.com/id/How-to-Make-a-Desktop-Viking-Catapult-with-a-bonu/

Thanks to everyone who voted for me in the Office Supply Contest!

Here's a video of it firing:
 
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Step 1: What You Need:

Picture of What You Need:
- 5 pencils
- 2 pens
- A plastic bottle cap
- At least 14 elastics
- A craft knife or pair of scissors

Step 2: Making The Frame Part 1

Picture of Making The Frame Part 1
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- Take three pencils and arrange them in a triangle and use elastics to hold them together. This will be the base
- Use an elastic to attach another two pencils together into a V shape
- Then take the V shape and use elastics to attach the forks to two of the corners of the triangle

Step 3: Making The Frame Part 2

Picture of Making The Frame Part 2
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- Place an elastic over one of the arms on the V and pull it through itself (see the first picture)
- Put the pen through the elastic as shown in the second picture
- Pull the elastic tight and wrap it around the pen and frame
- Repeat this for the other side
- Do the same thing with the other end of the pens near the back of the frame

Step 4: The Ammo Pouch

Picture of The Ammo Pouch
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- Use the craft knife to cut a hole in the top of the plastic bottle cap and three in the sides roughly equal distances apart
- Thread elastics through the holes in the sides and pull them through themselves to secure them
- Tie a knot in another elastic and thread it through the hole in the top of the cap, with the knot inside the cap
- Make sure the knot doesn't come through the cap when you pull the elastic
Coolio
M3G (author)  pandyboohoo1 year ago
Thanks!
Love it! Reminds me of the thing, that little genius makes in "Little Man Tate" – cool
weredude2 years ago
this is a really great instructable! I shall make one in the near future. also please check out my office supply catapult!
http://www.instructables.com/id/office-supply-catapult/
M3G (author)  weredude2 years ago
Thanks! Your catapult looks good, how powerful is it?
weredude M3G2 years ago
mine shot about 30-35 feet, it really depends how far you wind the pencil up in the string.
mikeasaurus2 years ago
Looks great! Do you have any video of it firing? How far does it shoot?
M3G (author)  mikeasaurus2 years ago
Thanks! It shoots between about 20 and 35 feet. I'll make a video of it firing as soon as i have time.