I read a myth (below) that said striking a drop of water with a hot iron and hammer will send the hammer flying. luckily I just met a local Blacksmith!
Trez is a great guy, he has a small channel, but mainly focuses on working as a blacksmith. He makes all his own hammers and tools, and could make you something too!
"When you spit on a piece of red hot iron, it dances around in a little ball. If you hit the ball with your hammer, the explosion will throw the hammer over the barn and blow a hole in the iron!"
Source - http://ufdcimages.uflib.ufl.edu/AA/00/00/03/83/00060/AA00000383_00060_194.pdf (Page 205, middle on the right)
Why do blacksmiths ring their anvils?
WELL THEN, Once upon a time long long ago and far far away; on an island where the grass is emerald green,
A VILLAGE SMITH was shoeing a horse at his open air shop. His large anvil rang with each blow to the shoes. Standing quietly in the shade of the spreading chestnut tree, the horse waited patiently.
THE DEVIL, passing by, heard the ringing of the anvil and decided to see what was going on. He stood watching as the blacksmith made a wonderful set of new shoes for the horse.
THE SMITH then proceeded to trim the horse's hooves and nail the shoes in place. The horse stood quietly as this was done, and when the smith finished, the owner of the horse mounted his steed and took him for a trot down the road.
THE HORSE was noticeably happy with his new shoes, for he danced and he pranced all the way to the corner and back.
SEEING THIS, the Devil being a hoofed creature himself, decided that he must have a set of these wonderful shoes. He approached the smith and told him to prepare a set of shoes for him.
THE SMITH (realizing that this was the Devil himself), made a set of shoes too small, trimmed the hooves too short and drove several close nails in each of the devils hooves. He also clinched them quite heavily so they would not come off easily. The Devil in terrible pain, lame and very sore footed went running away and suffered for many days.
SO to this very day when ever the Devil hears an anvil ringing he makes it a point to stay as far away as possible.
THIS is also why hanging a horseshoe over the door keeps the Devil away!
Source - https://www.anvilfire.com/21centbs/stories/PPW/anvil_ringing2.htm
High speed camera - Chronos 1.4