Originally, when a player castled it was customary to stack the king on top of the rook. After which the opponent had to surround the rook with pieces until the king starved. Later this system was abandoned, because oftentimes players would bring bits of food to give to the king while their opponent wasn't looking.
source:
The Big Book of Very True Facts, by Leandord Irving Atkinson Remingham
This is forum to submit TRUE interesting facts about chess, please site all sources, here are mine.
Did you know that the Queenpawn opening was invented by Dr. Harvey Queenpawn?
From: the Internet
In the jungles of New Zealand, chessplayers wear helmets so as not to poke their eyes on pointy bishops.
From : a mighty wind
Chess evolved from monkeys
From: god
YOUR TURN!