It's a joke. In the original Bladerunner film they are using a so-called "Voight-Kampff" test to find out if someone is a human or a replicant (artifical humanoid), which has a similar purpose as these "I'm not a robot" tests. The quoted question is from a scene where the test was conducted on a replicant, who then shot the interrogator.

Here is the scene (violent at the end): https://www.youtube.com/watch?v=cIFMwObyst4

BTW, the movie is very worth watching IMO.