| | In the courtroom, the prosecution first calls Mrs. French's landlady, Janet Mackenzie, who testifies that she heard Vole arguing with Mrs. French on the night of the murder. She claims that Vole exchanged heated words, and then left the apartment, saying he was going to a movie. However, Owen proves that Mrs. Mackenzie could not have heard what she claimed over the noise produced by her [[eggbeater]], a prototype model given to her by Vole, who had invented it. (The revolutionary eggbeater design is something of a [[McGuffin]] in this film; it makes only one appearance, but it is mixed up with the entire plot.) The prosecution calls more witnesses — a police officer, a woman living across the street, a travel agent — but each one can offer only circumstantial evidence, and Sir Wilfred shoots down each of their stories in turn. | | In the courtroom, the prosecution first calls Mrs. French's landlady, Janet Mackenzie, who testifies that she heard Vole arguing with Mrs. French on the night of the murder. She claims that Vole exchanged heated words, and then left the apartment, saying he was going to a movie. However, Owen proves that Mrs. Mackenzie could not have heard what she claimed over the noise produced by her [[eggbeater]], a prototype model given to her by Vole, who had invented it. (The revolutionary eggbeater design is something of a [[McGuffin]] in this film; it makes only one appearance, but it is mixed up with the entire plot.) The prosecution calls more witnesses — a police officer, a woman living across the street, a travel agent — but each one can offer only circumstantial evidence, and Sir Wilfred shoots down each of their stories in turn. |