"[In Costa Rica] Making a fist with the thumb sticking out between the middle and index fingers is obscene. This gesture is known as the 'fig.'"

"In Japan and South Korea, visiting executives are usually invited to participate in after-hours drinking bouts."

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What customs should I be aware of if my clients are from around the greater St. Louis area, Clayton, Chesterfield, St. Charles and such?

This false identity generator is great. If it had API hooks someone (probably not me) could create a browser extension that fills web forms with the generated information.

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