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Myrtle drunkenly comments on Daisy again and again. Tom warns her not to mention Daisy; she continues to do so until Tom, in frustration, punches her and breaks her nose. At some level, Tom is violent which may be a foreshadowing of how he will act later in the novel.
At the end of chapter two, Tom hits Myrtle because she drunkenly mentions Daisy's name. This shows how violent Tom is which foreshadows future actions.