This could be a reference to Ernest Hemingway’s short story “The Killers,” in which a clock that’s running 15-20 minutes fast plays a central role. The clock ties in with Andre’s butter-knife-sharp memory—both might be a little off
Hemingway is also known for his minimalist style. Although enigmatic and symbolic, he is best known for being concise (but effective).
Also, Hemingway is known for his gift of narration and story telling. Andre 3000 could be calling attention to the fact that he had begun narrating kind of unconsciously on an event he’s been reflecting on, and is realizing this with a rhetorical, “What am I Hemingway?”
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