which directors were the biggest jerks and hardest to work with?

Clift found the long scenes exhausting and had to have his longest scene shot in multiple takes, one or two lines at a time. His shaky performance led director Joseph Mankiewicz to ask Spiegel several times to replace the actor.[4] Most of the crew were sympathetic toward Clift,[9] but Katharine Hepburn was especially resentful of the poor treatment to which Mankiewicz subjected him. Indeed, Hepburn found Mankiewicz's conduct so unforgivable that as soon as he called the final "cut" of the film, she asked him to confirm that her services were no longer required, and when he did, she spat in his face.