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[[File:Open Manhole and Cover Mid-City New Orleans.jpg|thumb|A round manhole and its cover]]
Microsoft popularized the question of why [[manhole covers]] are typically round (in some countries) when they began asking it as a job interview question.<ref name="Poundstone" /><ref name="Davis">{{cite web|last=Davis |first=Jim |url=http://www.joblossguide.com/2009/02/why-are-manhole-covers-round_10.html |title=Why Are Manhole Covers Round? |publisher=Joblossguide.com |date=2009-02-10 |access-date=2011-04-08 |url-status=dead |archive-url=https://web.archive.org/web/20110612064454/http://www.joblossguide.com/2009/02/why-are-manhole-covers-round_10.html |archive-date=June 12, 2011 |df=mdy }}</ref> Originally meant as a psychological assessment of how one approaches a question with more than one correct answer, the problem has produced a number of alternative explanations, from the [[tautology (rhetoric)|tautological]] ("Manhole covers are round because manholes are round.")<ref name="Poundstone" /> to the philosophical.
The practice of asking [[lateral thinking]] questions was later formally discouraged at Microsoft.{{cn|date=July 2022}}
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