Want to work at Google? Answer these questions
wired.co.uk
wired.co.uk
Similar articles have been written many times over, here's a thread with all that is relevant: http://news.ycombinator.com/item?id=1130984
With the caveat that I have no knowledge about how hiring works in sales, finance and, well, every area outside of engineering, if you want to get hired in engineering, almost none of this is relevant.
I don't know who perpetuates these myths but they're simply not true.
Interviewing as a software engineer will involve being asked questions that demonstrate your ability to formulate a solution (and turn it into code), test your knowledge of fundamental algorithms and test system design.
Questions about being shrunk to a penny and other such obtuse brain-teasers have never, to my knowledge, been part of engineering hiring. Individual interviewers may stray into this territory but they're not following (current) protocol if they do.
Of course, I can't speak to how things were years ago (before I joined) but it's not relevant now. Ignore this advice.