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"We locals call it 'the cave-in,'" local resident and crater explorer Erel Struchkov told Reuters as he stood on the crater's rim.

Hadas Erel, who heads research on social human-robot interaction at the Media Innovation lab in the Interdisciplinary Center in Herzliya, Israel, recently demonstrated this with two simple, plain white robots.

The point, Erel says, was to show that “any robot is always social” and therefore designers need to think about how people might misinterpret robot behavior.

Given the extent of our sensitivities, Erel is wary of any robot designed to deliberately diss humans.

“So sometimes people do want the robot to be a motivator,” says Erel, who led that study.