 Avoidance behavior can be acquired in the absence of a signal. Suppose the experimenter arranges a schedule in which a bright light turns on for 5 seconds every 30 seconds, and a response or some number of responses at any time during the interval resets the clock to zero. This type of arrangement is known as free-operate avoidance. Why? Because the avoidance behavior is free to occur at any time and will delay the presentation of the light. And ladies and gentlemen, we saved up for a year for that prop for a 45-second video. Free-operate avoidance!