Was Mark Harmon a diva on "NCIS" that led to his unexpected exit? Was Mark Harmon a diva on "NCIS" that led to his unexpected exit? According to a report by Globe, Mark Harmon left the show because he couldn't handle the schedule anymore and was pulling everybody down with his grumpy attitude.

In a book, 'Mork and Mindy' star Pam Dawber revealed that the late actor Robin Williams often behaved inappropriately on set. Williams groped her and appeared naked, but she didn't mind at all.