Sentence 1: Dave head up a bank teller at gunpoint and demanded all the money. 
 Sentence 3: Dave felt embarrassed by how low he had sunk since then 
 Sentence 4:  The teller handed over the money and wrote put a note with it 
 Sentence 5:  The note said he hoped to see him at the next reunion 
 Option 1: The teller recognized Dave from their high school days. 
 Option 2: The teller didn't recognize Dave.