Or just not serious about the position. If the oddball questions are posed during an interview, you can ask about the oddball questions. I think I would do that after giving a straight answer. Wisecracks are not an option. If it is some sort of timed and scored written test, well, I guess what you do depends on how badly you still want/need the job.

I regard an interview as a two-way process. I interview them while they interview me. I wouldn't reject a job because of an oddball question, but I would want to understand what they were doing. I do sometimes reject jobs up front when I see patterns in the job ads that tend to go with a messed-up work environment (then again; sometimes I don't-maybe the ad is just poorly written). With that kind of pre-weeding, so far, oddball questions haven't been an issue.