Apparatus for use in thwarting an attempted hijacking of a vehicle utilizes a fluid chemical agent which irritates living human tissue upon contact. The fluid is contained in a reservoir, and is flowed under pressure to spray nozzles via tubes. The nozzles are located relative to the vehicle to spray the agent onto a hijacker so as to produce discomfort and disorientation. An automatic actuation system sprays fluid out of the nozzles when the system is enabled, the vehicle is running, and one of the vehicle's windows has been broken. Agent may also be sprayed by manually actuating an override switch into an energized position.
