Evil, wicked, mean and nasty! The Notorious Rabbit is a compact analog octave fuzz based on a nonlinear gain architecture and passive filtering. It is designed to operate with high sensitivity to source conditions, exploiting instability and saturation behavior as primary elements of its response. The input signal passes through a selectable filter network that defines the frequency content presented to the gain stage. This stage is based on a Darlington configuration using both silicon and new old stock germanium transistors, resulting in a non-linear and dynamically reactive amplification characteristic.