That Massai say hello by asking “How are the kids?” , Kasserian Ingera, and the appropriate response is “The kids are fine”. This comes to you courtesy of our school district superintendent, and all other references also seem to be from US educational circles, which means this may be an urban legend, but if so it’s a good one.
Cambodians say hello by asking whether you’ve eaten yet, similar to grandmothers.
Chinese and Thai specifically ask whether you’ve eaten rice. Russians, of course, wish you health, and Georgians wish you victory.
Kosovars don’t mess around – they ask whether you’re getting old (the correct response is “a bit”).
Zulus say “I see you” and the response is “I exist for you”, which is very Max Frei and very touching.