A spontaneous prank by an employee against a fellow employee, even during a period of enforced waiting in the course of employment, does not give rise to vicarious liability where the prank was generated wholly within the employee's mind and was not done in furtherance of the employer's interests, under express or implied authority, or as an incident to anything the employee was employed to do. The motive or state of mind of the wrongdoing employee (such as boredom) is irrelevant to vicarious liability except where the employee is seeking to advance the employer's interests. However, the dissent suggests that where horseplay is foreseeable and tolerated by the employer, and occurs during employment-related waiting time, a different conclusion may be reached.
The full text is available to signed-in members, including the 5 later cases that cite this judgment.
1 of the 5 citing cases carry a classified treatment. How each court treated it is available to signed-in members.