Several decades ago, a group of researchers encountered a group of locals in Papua New Guinea who had had no contact with other cultures or people for over 10,000 years.
The researchers desperately tried to communicate with them, attempting to use words from neighboring tribes, but the language was so radically different that the only commonality in the language was the names of the local rivers.
So the researchers began to list the rivers one after the other when the natives suddenly looked at them like this:
Then, suddenly, the expression changed to this:
At that moment, the researchers realized that although these people used a language separated from all other languages by millennia, they still had the same facial expressions for "confusion" and "amusement." The researchers had listed the rivers incorrectly, and it was then that the locals realized the researchers had made a mistake.
So, if you see someone who looks like this:
Everything is fine. However, if you see someone who looks like this:
Run away very quickly.