Splinching

"Splinching, or the separation of random body parts, occurs when the mind is insufficiently determined. You must concentrate continually upon your destination, and move, without haste, but with deliberation…"

- Wilkie Twycross

Splinching is what occurs when a witch or wizard Apparates or Disapparates unsuccessfully, leaving part of his or her clothes or body behind in their former location. The degree of splinching can range from minimal, such as loss of hair, to life-threatening, such as loss of flesh or muscle, though the damage is usually repairable.

Known cases of splinching
"There was a horrible screech of pain and everybody looked around, terrified, to see Susan Bones of Hufflepuff wobbling in her hoop with her left leg still standing five feet from where she had started."

- Description of Susan's splinching

Susan Bones splinched herself during her first Apparition lesson, losing a leg; it was reattached, but the incident left her shaken. It was said to be the first "exciting thing happening" during the lesson.

Ron Weasley failed his Apparition test due to leaving half of an eyebrow behind. Having left school in his Seventh year without ever having passed the test, he was badly injured after splinching away part of his upper arm while escaping from the Ministry of Magic and Grimmauld Place in 1997. He was saved through the quick first-aid work of Hermione Granger, who applied Dittany to the wound. When he briefly abandoned Harry Potter and Hermione Granger, he ended up losing a pair of fingernails.

Arthur Weasley told Harry, Ron and Hermione about two people who tried apparation without a licence and splinched themselves, leaving half of themselves behind.

Previously Splinched people

 * Two wizards detained by the Ministry
 * Susan Bones
 * Ron Weasley

Behind the scenes

 * According to W.O.M.B.A.T., it may be possible to prevent bad luck by turning on the spot three times and deliberately splinching one's thumbs. According to Wilkie Twycross, the splinched body parts are random, meaning it is not possible to deliberately splinch the thumbs.

Appearances
Расщеп
 * Harry Potter and the Goblet of Fire
 * Harry Potter and the Half-Blood Prince
 * Harry Potter and the Deathly Hallows
 * Harry Potter and the Deathly Hallows: Part 1
 * Harry Potter and the Deathly Hallows: Part 1 (video game)
 * LEGO Harry Potter: Years 5-7