"Der Satrap", the Voigtländer photo magazine, ran a competition with this theme in 1934! I happen to have some of those magazines at home, so I may post some of the more creative solutions after I get home
- Fodder for hand catapult. I haven't tried it so the aerodynamics of the plastic spool could be bad. Could be useful as a weapon during a riot or a football game.
Being back in physics class for the first time in *cough*twenty*cough* years, I can now definitively tell you that unless you get your catapault shot right in someone's trachea, it won't be much use that way.
We went slingshotting in class last week to measure kinetic energy and what did I have in my pocket? Yes, a 120 spool.
Smack the airborne ranger just back from Iraq upside the head with it at your own peril. Trust me on that one.