Latin for "to a willing person, no injury is done." This doctrine holds that a person who knowingly and willingly puts himself in a dangerous situation cannot sue for any resulting injuries.
Anyone ever try to use this as a defense against a debt collector? What about comparative negligence and unjust enrichment:
A legal doctrine stating that if a person receives money or other property through no effort of his own, at the expense of another, the recipient should return the property to the rightful owner, even if the property was not obtained illegally.