THE MARTIAN from Stories for Nighttime and Some for the Day by Ben Loory.
"The three of them sit down to dinner. Halfway through the soup course, a Martian enters the room. It takes the astronaut’s napkin and lays it across his lap. Then it turns around and walks out.
I thought you said you didn’t see any Martians, says the woman.
Not on the moon, says the astronaut, no."
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