If you could send a message to the entire world, what would you say?

In The Hitchhiker’s Guide to the Galaxy, the most popular book in the galaxy got that way not because it was better than its competitors but because “it is slightly cheaper, and because it has the words ‘DON’T PANIC’ in large, friendly letters on the cover.”

If there was a chance to send a message to the entire planet the words “DON’T PANIC” might be a calming and reassuring message of peace. It might also get people angry and aggressive as they wonder what it is that shouldn’t drive them to panic. The latter could be the reason why the book in Douglas Adams’ classic was also popular” despite its many glaring (and occasionally fatal) inaccuracies”.

What message would you send to the entire planet? One of calming reassurance, one of direction, or would you post a question?