Aliens suddenly show up on Earth. They ask to meet with the world leaders, and as they greet each one, they hold up a small black rectangle up over their eyes for about 3 seconds and smile, then move on to greet the next. After a while, one of the leaders asks, "Why are you holding up the rectangle over your eyes?"
The aliens reply, "We have been watching your species for several years, and whenever you come across another species from your planet, you do the same thing. We assumed it was the appropriate greeting." The man is puzzled for a second but then remembers the smartphone in his pocket....
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