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Wikipedia
Tell and his son would be executed, but he could redeem his life by shooting an apple off the head of his son, Walter, in a single attempt. Tell split the apple with a bolt from his crossbow.
But Gessler noticed that Tell had removed two crossbow bolts from his quiver, not one. Before releasing Tell, he asked why. Tell replied that if he had killed his son, he would have used the second bolt on Gessler himself. Gessler was angered, and had Tell bound. He was brought to Gessler's ship to be taken to his castle at Küssnacht to spend his newly won life in a dungeon. But, as a storm broke on Lake Lucerne, the soldiers were afraid that their boat would founder, and unbound Tell to steer with all his famed strength. Tell made use of the opportunity to escape, leaping from the boat at the rocky site now known as the Tellsplatte ("Tell's slab") and memorialized by the Tellskapelle.
WALTER
William Tell supposedly shot an apple off of his son's head with an arrow.
An apple
William told his son to shoot the apple off of his head to prove his marksmanship in the story of William Tell.
William Tell.
The best known William Tell is a hero of Switzerland who was forced to shoot an apple on his son's head using a crossbow in order to save the life of his son. He was a mythical character.
William Tell the musician was born in February, 1980. No one knows when the mythical William Tell lived, the one who shot an apple off his son's head.
kill
William Tell.
There were multiple paintings in which Dali depicted William Tell, or included William Tell in the title of the painting, such as The Enigma of William Tell and William Tell. In these paintings, Dali uses William Tell to represent his own insecurities about his father, and the ability of a father to willingly put his own son in danger, as Dali feels his own father did.
He was famous for having to shoot an apple off of his son's head.
Click the link for an explanation of the legend.