Note: Some of the steps were hard to follow, so those are separate instructables (just click the link)
Steps 1-3 Office weaponry
Steps 4-6 Pranks
Steps 7-9 Timekilling
Steps 10-11 Top 10 things
Step 12 "Cleaning your room"
Step 13 Conclusion
Step 1: How to fire rubber bands one handed
So here goes...
1. Make your hand into a gun shape
2. Pinch the rubber band with your pinky
3. With it still pinched, pull it around your thumb (not wrapped around or anything)
4. Put the other end of the rubber band on the tip of your index finger
5. Release pinky (shoots)