If a defendant in a civil or criminal case wants to provide an alternative set of facts to those provided by the prosecution or the plaintiff, this is called an "affirmative defense". This shifts the burden of proof to the defendant to prove his or her version of the facts. The defendant would seek to excuse or justify his or her actions that brought the lawsuit. Common affirmative defenses include entrapment, Self-defense, unclean hands, insanity, and the statute of limitations.