When you turn on the TV, it sends a nice static charge into the foil on the screen, and the bowl on it. The bottle cap swings over and gathers charge, and then swings to the other and dumps it into that side, and swings back again, ringing like a gong. This is called "Franklin's Bells", and is perhaps the first electric motor. He attached his to a lightning rod instead of his TV, and used it to detect incipient lightning. For more fun, see scitoys.com, e.g. this one.
That guy who plays Morpheus in the Matrix movies may have had the best role of his career as Cowboy Curtis in Peewee Herman's "Peewee's Playhouse" series, now available on video.