Marshmallow Shooter -- HOWTOONS
Using PVC pipe you can make this amazing marshmallow shooter.
Howtoons: The Possibilities Are Endless! by Saul Griffith, Joost Bonsen, and Nick Dragotta
Part comic strip and part science experiment, Howtoons shows you how to turn common household items like soda bottles, duct tape, mop buckets, and more into Tools of Mass Construction!