First poster : A man lying in the hot desert sand ... totally exhausted and fainting.
Second poster : The man is drinking Cola Third poster : Our man is now totally refreshed.
And then these posters were pasted all over the place." "Terrific! That should have worked!" said the friend. "The heck it should have!" said the salesman. "No one told me they read from right to left!"
From somewhere on the Internet!