One of my coworkers exposed himself to me soon after I started working there.
HR got involved when I told another coworker. He defended himself by blaming me for not being more aggressive about shutting him down. HR concluded we were both at fault and forbade either of us to speak about it again to anyone or we'd be fired. This is a Fortune 50 company. It still bothers me, and my coworkers have no idea why I act so distant.