Wombat wrote:
I remember a news story from a couple of years ago.
A tourist was swimming in Greece and he started swimming into a restricted military area.
A guard saw the swimmer and motioned him to come in by raising his hand palm down and waving his fingers.
To us that means "goodbye" so the swimmer turned around and the guard shot him!.
Here's the problem. To us palm down means goodbye and palm up means come here.
Talk about a "problem in communication"

That reminds me of a fairly well-known (so-called) joke:
An Englishman is walking by a river when he sees a Scotsman flailing about in the water. The Englishman calls out to the man in the water, "are you ok?" The Scotsman cries out "I will drown and no one shall save me!" So the Englishman says, "have it your way then", and walks off.