Abstract: The present invention relates to a device for deterring animals from engaging in prohibited behavior. A flap pivots about retainers mounted on a base. An elastic member extends from under the base to a protruding tab on the flap. Disturbance of the base, such as by the undesired activity of a pet, causes movement of the flap relative to the base and contraction of the elastic. The flap accelerates about the retainers and impacts against the base. This generates a sharp startling sound and movement of the device which acts to discontinue the activity and deter the animal from the repeated occurrence of such behavior.