Erich: Taxidermy -- I've got nothing....though (minor nitpick) Mike's scene is actually from The Man Who Knew Too Much and not Vertigo
Mac: Killer Cars -- I can't believe I'm saying this, but the first thing that popped into my mind was the killer Volkswagon Beetles that chased Keenan Wynn around in one of the Herbie movies. (fallback because Mac took KARR)
Mike: Where'd the body go? -- Along the lines of Erich's answer, I'm going to go with a pretty funny sequence in Murder By Death where Alec Guinness is found dead, first clothed, then naked, and then his clothes return but the body is missing. "Butler gone, but pocket still there??"