Instructables
Picture of Exploding Arrows Skewer Gun
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Materials: pen tube, rubber band, tape, skewers, caps

Procedure:

1. Take a pen tube, making it by taking a pen and splitting it apart.

2. Attach a rubber band to the end of the pen tube, taping it on.

3. Take a cap and insert it onto the end of the skewer.

4. Shoot the skewer out of the pen tube and watch it explode as it hits into a wall or something....

Note: You usually have to get the trajectory of the skewer just right to get it so it hits a wall and explodes.

Here is the video to this project since it won't publish here: http://www.youtube.com/watch?v=0VageZVeOc0
001.MPG25 MB