Interesting facts about horseshoe

Why are horseshoes considered lucky????

The belief comes from a sixteenth-century idea that iron horseshoes were a protection against witches and evil.

Antiquarian John Aubrey wrote in his 1696 book Miscellanies that the reasoning was that Mars (the roman god of war and associated with the metal iron.) was the enemy of Saturn (ruler of the witches).

Another interpretation of the superstition is that a horseshoe held on its side makes a 

"C" for christ.