sandwich bag catapult
this is an easy one, and can be quite powerful in the wrong hands. I definitely never used this to stick pickles to the cafeteria ceiling. No sir, not me!

ingredients:
 Zip-Lock™ or similar sandwich bag
 something to launch

(1) blow up the bag
Fill it about half way then seal it shut. If the bag is too full this won't work as well.

(2) Ready ...
Push your item into one of the bottom corners.

(3) Aim ...
Before you hit the bag, be careful. First, this mechanism magnifies your strength. Second, this device has poor aim.

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