No single worst one: just all the sordid "Fermi questions" designed, it seems, to make the interviewer feel smart -- so godawful smart, in fact, that he can rea

No single worst one: just all the sordid "Fermi questions" designed, it seems, to make the interviewer feel smart -- so godawful smart, in fact, that he can read your soul like a blueprint based on how you answer a captive whiteboard session about sorting a quadrillion bowling balls using only tinker toys and yard of string; sieving primes using roman numerals; or whatever might strike his fancy at the moment.