[details=“English Translation”]If there are two in a room and three go out, one must go in, so that none is in the room.[/details] Is this a riddle? It doesn’t make sense to me. I feel very foolish.
I just took it to be some sort of lighthearted non-sensical joke indeed 
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A variety of an old joke:
A mathematician, a priest and a biologist are sitting in front of a house.
Two persons go in, three come out.
Says the priest: “A miracle, a miracle!”
Says the biologist: “They’re breeding fast.”
Says the mathematician: “If another person goes in, the house will be empty again.”
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