I once interviewed a candidate for an engineering position in Seattle. It quickly turned out that he had fabricated his entire work history and education. My first clue was that he claimed two years of work experience at Costco HQ in Issaquah, Washington but he pronounced it as "Is-ACK" (the local pronounciation is "IS-uh-kwah"). No one who spent two years in Issaquah would ever pronounce it that way, regardless of the accent you're coming from. His story just got weirder from there.

[1]: To this day I'm not sure why -- he actually performed quite well on the tech part of the interview and might have gotten an offer if he hadn't turned out to be so untrustworthy!