Two lengths of PVC pipe, one slightly wider in diameter
A good pair of pliers with cutting mechanism
Duct tape - PLENTY of duct tape
An earplug - If you don't have an earplug, get a foam sticky dart - If you don't have a foam sticky dart, get some Styrofoam.
Some tough scissors
Petroleum jelly, optional
You got that stuff? Okay, nothing's stopping us from building a PVC Air Launcher! Let's get started!