When will the world end?
For this question, Siri is even more creative. You can hear her saying “Right after you hear the words ‘fire it up!’.” There are other times when she would explicitly say she doesn’t know. She will comfort you though by saying “I don’t know, but I wouldn’t worry about it… there are other perfectly good universes,” or “Well, Unix 32-bit time overflows on January 19, 2038. She also answers “Whenever they start building that intergalactic bypass,” at times, which is in reference to The Hitchhiker’s Guide to the Galaxy.