This occurs when an employee is subjected to comments of a sexual nature, unwelcome physical contact, or offensive sexual materials as a regular part of the work environment. For the most part, a single isolated incident will not be enough to prove hostile environment harassment unless it involves extremely outrageous and egregious conduct. The courts will try to decide whether the conduct is both "serious" and "frequent." Supervisors, managers, co-workers and even customers can be responsible for creating a hostile environment.