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I'll start
There an old man who has 3 children and decides he wants to pass down his farm to the child who can build the biggest enclosure for his animals. The oldest child decides to build a square enclosure with a side length of 200 metres, the second oldest child decides to build a circular enclosure with a radius of 225 metres. The youngest child creates a triangular (equilateral) enclosure with each side being 2 metres long. The old man then asks each child why they have chosen an enclosure and why they think theirs is the biggest. The oldest says " A square enclosure means that we can easily lure the animals into a corner to feed them, mine is biggest because squares are the biggest and easiest shape to calculate". The second oldest child says " A circular enclosure means we can have a gate on any place of the enclosure, and we don't have to get the animals into a corner to feed them, my enclosure is larger because circles areas are in terms of pi, and I like pie". The youngest child then gives his speech. After some thought the old man decides to give his farm over to his youngest son, what could be have said to convince his father?
He went inside of the enclosure and said "I declare myself to be on the outside"