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If you're a hiring manager who uses these things, you should know that I (try) to train/prepare my students to answer them. I do think there is some utility in watching how people approach an unconventional problem, but don't be too impressed with people that can solve them easily, compared to those who don't do well the first time they see them. I see a huge improvement in the quality of answers of most students, once students know it is a gag and once they've been shown how to estimate things. Most students are constrained by having been in a learning environment that provides them with well-defined boundaries within which to form their answers. IMO failing to perform well with these problems is not always a failing of the student as much as it is their educators.