What function does the clock play in Safety Last?

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  1.  At least one page. 1. Harold Lloyd called Safety Last a “thrill picture.” What made him describe it this way?
  2.    2.  What function does the clock play in Safety Last?

Safety Last( film):   https://www.youtube.com/watch?v=RBnMt9iUwI0

Safety Last ( Lecture):  https://www.youtube.com/watch?v=JVO_iFZrrmM&feature=youtu.be