Darby, exhausted from the fracas, leans
against a fence post, which breaks and sends him plunging to his death.
It is the owner's responsibility to provide reasonable notice and take reasonable precautions
against unwanted trespass; e.g., putting up a wall or
fence, closing and / or locking a door or gate,
posting signs and / or hiring security to patrol the property and enforce property rights - or occasionally checking to make sure their property isn't overrun with squatters.