re: #76 Eclectic Cyborg

Some limits:

Texas has a self-defense law based on the castle doctrine. The law has a “stand your ground” clause, meaning the person using physical or deadly force against an attacker does not have a duty to retreat. Deadly force is permissible under the law when a person is attempting to defend himself from deadly force of an attacker in his home, vehicle or place of employment, or against attackers who are committing crimes of kidnapping, murder, sexual assault or robbery.

The law provides civil immunity to persons who use authorized deadly force against attackers.
http://civilliberty.about.com/od/guncontrol/a/Texas-Gun-Laws.htm