Shouldn't you know better than to ask a bioengineered human being about his mother? In Scott's dystopian Los Angeles, ca. 2019, the Voight-Kampff Test is administered to separate "replicants" from humans at the Tyrell Corporation. Ex-cop/"replicant" bounty hunter Rick Deckard (Harrison Ford) watches a video of a replicant named Leon who grows agitated by the strange questions posed to him by a Tyrell employee. At first it's unclear whether Leon simply doesn't possess the appropriate information to answer the questions. How would a machine know about turtles if he's never seen one? But when Holden, the testing monitor, asks, "Describe in single words only the good things that come to your mind, about your mother?" "My mother?" Leon repeats. A beat passes; Holden feels like he's getting somewhere. "Let me tell you about my mother." He fires off a single shot from a gun under the desk, which sends Holden flailing into the wall behind him. Leon fires again, right into Holden's chair, and the latter is shoved forward into another desk.