Answer :
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1. In Alfred Hitchcock's explanation, surprise is when the audience doesn't know something is going to happen, and suspense is when the audience knows something is going to happen but doesn't know when or how. In "Arsenic and Old Lace," we see this difference played out through the comedic elements involving the two sweet old ladies who commit murder. The audience knows about their dark secret, creating suspense as we wonder when and how their actions will be revealed. On the other hand, surprise elements may include sudden plot twists or unexpected events that catch the characters or the audience off guard.
2. For "Wait Until Dark," we can observe the difference between surprise and suspense in a different way. In this film, suspense is built through the anticipation of the blind protagonist's confrontation with the intruders in her home. The audience is aware of the danger lurking around her, creating tension and keeping us on the edge of our seats. On the other hand, surprise moments might include unexpected actions by the characters or unforeseen plot developments that shock both the characters and the viewers.
By understanding these distinctions, we can appreciate how Alfred Hitchcock's principles of surprise and suspense are manifested in different ways in "Arsenic and Old Lace" and "Wait Until Dark."