Most difficult interview question

This was asked in the UPSC civil services interview. The candidate was of engineering background.
Why does milk overflow when boiled while water does not?

His answer was, When milk is boiled, the moisture in it becomes vapour. But it is trapped under the top creamy layer of milk. So, the vapour tries to push out, spilling out the milk. In case of boiling water, vapour freely evaporates.
He became an IPS officer. He mentioned this in his success story in the newspaper, adding that he was surprised by the question.
P.S. : Some people are saying it's not a difficult question considering the standards of UPSC. The great thing about this question is, it can be asked in ANY interview, which makes it a good interview question. Such a beautiful question is worth mentioning. Thanks.

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