This experiment is actually multiple experiments using static electricity to move objects, including levitating plastic bags with a PVC pipe. Wingardium leviosa!
Rubbing two solid objects together, like cloth and PVC pipe, can result in an excess of electrons being built up in one of the objects. The difference in electrons between objects creates an imbalance. Sometimes this imbalance can influence the motion of small objects, kind of like a magnetic field. If the imbalance is great enough and the objects come into contact, the electrons can jump from one object to another, which creates a spark. Even a small static electricity spark can be more than 20,000 volts! Lightning is a form of static electricity that can travel thousands of feet and be more than 300,000 volts. For comparison, a flashlight battery is 1.5 volts, a car battery is 12 volts, and electrical appliances use 110 volts, but there are some other significant differences in the types of electricity.