Frolic and detour
Frolic and detour in the law of torts occur when an employee (or agent) makes a physical departure from the service of his employer (or principal). A detour occurs when an employee or agent makes a minor departure from his employer's charge whereas a frolic is a major departure when the employee is acting on his own and for his own benefit, rather than a minor sidetrack in the course of obeying an order from the employer.