I got this puzzle from a friend and thought it was a good one for this community:
In this space adventure, women from Neptune and Men from Jupiter always speak the truth, while men from Neptune and women from Jupiter always lie.
In this adventure, beings from Neptune and Jupiter live alongside each other. You’ll even find that pairs, consisting of one woman and one man, do not need to come from the same planet!
However, us earthlings are unable to determine if a being is from Neptune or Jupiter based on external features, and we're also unable to see or hear if it's a man or a woman we're talking to.
On one occasion, we meet a couple. We’ll call them A and B. They make the following statements:
A: We are both from Neptune.
B: No, that's not true!
Who is a man?