We used to ask job candidates a variation of the door in an infinite wall question [1]. The initial answer of many interviewees is to choose a direction and walk in that way forever, which is understandable, as infinity makes the question weird.

What is more interesting is, even after I pointed out that this answer has a 50% chance of finding the door and I'm looking for a 100% solution, some candidates refused to give it a second thought, didn't change their answer, and insisted that this is the best course of action.

[1] https://math.stackexchange.com/questions/3915578/door-in-an-...