I feel like interviewers can always pull shit out of their asses to test you unprepared, but the purpose of these is moreso to test your genuineness and critical thinking as opposed to if you "prepared" and answer.

In any case, I've only gotten 2 so far that have been "wtf:"

1. What would you do first with the knowledge you have now if you were a medical professional/scientist thrown back a century ago
2. What sentence do you want me to write down that best portrays what we've discussed (my app, interview, etc.) to the admissions committee?
   1. for this question, i had a very cohesive narrative and essentially just re-iterated it; the interviewer said "that's what I would have said in your position, good job" then I saw him type it out lmao