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If it can cut through something this small, imagine what it can do to the rest of you!

One way of showing the sharpness of a blade is dropping a strand of hair, or thread, on it and watch it split it in half. Not to be confused with splitting hairs, which is about fine distinctions.


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    Comic Books 
  • Often subverted in Superman stories, especially in the height of the Silver Age, when Superman appeared to get amnesia about every other issue. They proved to him who he was frequently by trying to cut his hair with scissors - and the scissors would be cut by the hair, instead.

    Fan Works 
  • Various Vytal Ventures, "Hard and Soft": Ren does this to test his Storm Flower after cleaning and sharpening them.

    Films — Animation 
  • In The Adventures of Ichabod and Mr. Toad, Brom Bones intimidates Ichabod during his telling of the legend of the Headless Horseman by slowly splitting a hair off his head with a large knife.

    Films — Live-Action 
  • The Bodyguard: Frank Farmer demonstates the sharpness of a katana he owns by taking a silk scarf off the woman he's bodyguarding and letting it float down onto the blade, where it's cut by just its own weight.

  • On Gor, blades are frequently described as being "so sharp it would cut a piece of silk dropped on it."
  • In Sir Walter Scott's The Talisman, Saladin demonstrates the sharpness of his Saracen sword by dropping a cushion onto it, which is neatly sliced in half.
  • Shows up in Frank Stockton's short story The Discourager of Hesitancy (a sequel to his more famous "The Lady or the Tiger?").
  • The split-a-piece-of-silk variant appears in Interesting Times, when a samurai attempts to intimidate Cohen the Barbarian by cutting a silk handkerchief this way. Cohen then subverts it by throwing up a bogey-covered hankie, and decapitating three of them as they look up before they realize what's happening.
    • Death's scythe is described as so sharp it can split atoms - and even the text on a page in a different dimension.
  • In The Hardy Boys mystery "The Secret of Pirates' Hill", Joe drops an envelope on the blade of some pirate cutlasses in the museum to test it's sharpness. {Hint, it's very sharp}
  • In Water Margin, Yang Zhi, one of the novel's heroes, is forced to sell his family heirloom of a sword in the street. When confronted by a drunken local bully who demnds a dirt cheap price, he tells the latter that the sword is capable of "cut metals like mud, slice through hair by the merest touch, and kill people with no blood on the blade". It's all true, and Yang Zhi proved the third feature on the bully himself.
  • In Protector of the Small, Raoul demonstrates the sharpness of Kel's naginata to Flynn by placing a feather on the blade. It, of course, cuts the feather in half without any effort. Kel also tests the sharpness of a blade sent by her Anonymous Benefactor with a hair from her head.
  • In The Bible, Judges 20:16, the tribe of Benjamin had "seven hundred chosen men lefthanded", each one being able to "sling stones at an hair breadth, and not miss".
  • Noticeably averted in Inheritance Cycle where while training a dragon rider to care for his weapons properly an actual metalsmith points out that you don't want that sharp an edge on most blades, being that fine of a point also weakens the metal by making it so thin it can cut hair meaning the sword in question wouldn't last very long before being damaged beyond the point of usability as a sword rather then a mace.

  • In Sweeney Todd: The Demon Barber of Fleet Street, during the contest with Pirelli, Sweeney does this. Generally, on-stage, he pulls one of his hairs out, slices it, and watches it fall to the ground, all during a pause in Pirelli's song.

  • Gunnerkrigg Court: Kat and Annie test the Coyote Tooth, a blade made from the fang of a Physical God, by dropping a steel ball bearing on the edge; it's bisected without even slowing down.

    Western Animation 
  • Looney Tunes
  • Played straight and inverted in a Popeye short where Popeye and Bluto were competing store salesmen. Bluto shows that his knives are quality with this trope, then Popeye shows how crappy they are by having the hair split the knife.
  • A similar gag happened in the Talkartoons short "Dizzy Dishes".
  • Johnny Bravo has a similar joke when Johnny enters a lumber-cutting competition. After a lumberjack splits a hair with his axe, Johnny splits an axe with his hair—which was still on his head.
    Johnny: My hair is ready.


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