deadly force to regain possession of land or property. The term "make my day law" came to be used in the United States in 1985 when Colorado passed a law that shielded people from any criminal or civil liability for using force against a home invader, including deadly force. (The law's nickname is a reference to the line "Go ahead, make my day" (meaning 'do something so I have an excuse to kill you') uttered by actor Clint Eastwood's character "Dirty Harry" Callahan in the 1983 police film Sudden Impact.) Conditions of use Each jurisdiction incorporates the castle doctrine into its laws in different ways. The circumstance in which it may be invoked include the premises covered (abode only, or other places too), the degree of retreat or non-deadly resistance required before deadly force can be used, etc. Typical conditions that apply to some castle doctrine laws include: An intruder must be making (or have made) an attempt to unlawfully or forcibly enter an occupied residence, business, or vehicle. The intruder must be acting unlawfully (the castle doctrine does not allow a right to use force against officers of the law, acting in the course of their legal duties). The occupant(s) of the home must reasonably believe the intruder intends to inflict serious bodily harm or death upon an occupant of the home. Some states apply the Castle Doctrine if the occupant(s) of the home reasonably believe the intruder intends to commit a lesser felony such as arson or burglary. The occupant(s) of the home must not have provoked or instigated an intrusion; or, provoked/instigated an intruder's threat or use of deadly force. In all cases, the occupant(s) of the home: must be there legally; must not be fugitives from the law themselves, or aiding/abetting other fugitives; and must not use force upon an officer of the law performing a legal duty. In Colorado, the make-my-day statute provides the occupant with immunity from prosecution only for force used against a person who has made an unlawful entry into the dwelling, but not against a person who remains unlawfully in the dwelling. Immunity from civil lawsuit In addition to providing a valid defense in criminal law, many laws implementing the castle doctrine, particularly those with a "stand-your-ground clause," also have a clause which provides immunity from any civil lawsuits filed on behalf of the assailant (for damages/injuries resulting from the force