I was called in as a witness to a sexual harassment complaint. I had seen the behavior and heard what the co-worker said that triggered the complaint. It was so completely inappropriate.
You have to go through channels. My co-worker who filed the complaint went right by the book, and our (then) rat fink supervisor did everything he could to block it. Jerk. But she went through all the procedures just like she was supposed to.
My supervisor tried to act like I must not have heard the comment correctly, but I did. I heard it word for word. The harasser was fired and the supervisor was transferred to an all-male department.