A new trailer for “Gone Girl” debuted during Monday night’s Emmys broadcast and showed more footage of Amy (Rosamund Pike) and Nick (Ben Affleck) loving each other, hating each other and everything in between. Amy’s voice-over narrates for the audience: “Man of my dreams, this man of mine may truly … kill me.” We see how Amy and Nick meet, those creepy doll gifts and cameo from Neil Patrick Harris, who plays Desi Collings, Amy’s ex-boyfriend. Get pumped, fans. “Gone Girl” hits theaters Oct. 3.