From Amusements in Mathematics by Henry Ernest Dudeney (1917):
The men in the illustration are disputing over the liquid contents of a barrel. What the particular liquid is it is impossible to say, for we are unable to look into the barrel; so we will call it water. 
One man says that the barrel is more than half full, while the other insists that it is not half full. What is their easiest way of settling the point? It is not necessary to use stick, string, or implement of any kind for measuring. I give this merely as one of the simplest possible examples of the value of ordinary sagacity in the solving of puzzles.
What are apparently very difficult problems may frequently be solved in a similarly easy manner if we only use a little common sense.
Πηγή: futilitycloset
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