The Rooster on the Barn Roof

A rooster is sitting on the very top of a red barn roof.
The wind is blowing from the west at 10 miles per hour.
The rooster lays an egg right on the peak.
Which side of the roof does the egg roll down?
💡 Hint

Think about which chickens lay eggs.

Reveal answer

Neither side. Roosters don’t lay eggs; only hens do.

A rooster is a male chicken, and male chickens never lay eggs. So there is no egg, and it cannot roll anywhere. The wind and the roof are pure misdirection: they give your brain a fun problem to solve so it skips the part where it should question the premise. Good logic starts by checking that the situation can happen at all.

Did you know?Logicians call this kind of question a “false premise”: it assumes something untrue and asks you to reason from it. You see the same trick in everyday arguments, where a question is built on an assumption nobody has proven. Training yourself to notice it is one of the most useful habits in puzzle solving.

About This Puzzle

This puzzle is a farm-themed test of attention. It gives you plenty of details to think about, but only one of them really matters.

How to Think About It

The puzzle gives you wind speed, wind direction and roof position to make you think about physics. Before doing any physics, check the setup itself. Is every part of the story actually possible?

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