Possible candidate responses:

1. Solves it (too smart for job)
2. "That's bullshit, who needs this for a $14.50/hr job?" (too intolerant of bullshit for job)
3. Tries to solve it but fails (lacks self-awareness for job)
4. Knows they can't solve it so doesn't even try (too lazy for job)
5. Doesn't understand the question/comprehend what a hypercube is (too dumb for job)

I believe this is sometimes the case. I was called for an interview with a group of 15 other people ones. We were like a class, being interviewed as a group, and were supposed to solve some problems together. Nobody in that group could solve even the simple, obvious problems - we're talking basic math and reading comprehension here. Got an email the next day informing me that they had I had not been selected for recruitment.