The phenomenon of resonance is applicable to almost every branch of physics. Without resonance, there wouldn't be televisions or stereos, or even swings on the playground. However, resonance also has undesirable side effects such as irritating noises in the car and the catastrophic events such as helicopters flying apart. In this article, the author describes a resonance demonstrator that uses readily available and inexpensive parts. This demonstrator is useful to introduce and illustrate the concepts of frequency, harmonics, standing waves, and nodes and antinodes to students. (Contains 4 figures.)