Killing Curse
See AVADA KEDAVRA.
knee-reversing hex
no incantation given
Causes the target's knee to become backwards.
During the eleventh century, Gertie Keddle wrote in her diary that she hexed a man who came to retrieve a leather-covered ball from her cabbage patch, and she'd "like to see him fly with his knees back to front, the great hairy hog" (QA3).
no incantation given
Enchants knitting needles to knit.