Alfred Hitchcock projects

In order to elicit properly terrified screams from his star, Hitchcock pretends to attack her himself, and to make *his* performance more threatening, imagines himself attacking the people standing in the way of making his vision a reality (the head of the board of censors, who won't give him a certificate, the head of the studio, who won't give him any money, and his wife and her old friend, whom he believes are having an affair)

Example of:
Imagine Spot