Diana Ross supposedly fires anyone who refers to her as “Diana” instead of “Miss Ross”. (Michael Jackson supposedly fires anyone who refers to him as Michael instead of “Miss Ross”.)
A crew member who worked on the set of Island of Dr. Moreau (the Brando version) was also an amateur entomologist. On a televised interview I saw the crew member said he was thrilled to find a particularly rare bug while on location with the movie shoot and he was showing it to another crew member, telling him how endangered the species was. Val Kilmer walked up, looked at the bug, and snapped it’s head off with his fingers saying “They’re even more endangered now”. (Admittedly the whole point of the show as “Val Kilmer is a scumbucket”.)
Hugh Grant tossing canned goods at paparazzi didn’t make me lose any respect for him (they should be hit with canned goods more often than they are) but I’ll never not be able to think “lived with one of the world’s most gorgeous women and cheated on her with a cheap street whore- boy has issues”.
During the height of his “zaniness” (he seems to have mellowed a lot) Prince was reported to have fired employees for ignoring his telepathic communications. No idea if it was true.
Paris Hilton being asked by Larry King “name one thing about your life or your past that you’d change” and responding “My voice”, or being asked her favorite Bible verse (after mentioning how the Bible had become such an inspiration) and looking at him as if he’d asked her to recite the opening to the Aeneid in the original Latin, both of those tell everything you need to know about her sincerity as a person.