The Jelly-Fingers Curse (incantation unknown) is a curse that causes the victim's fingers to take on an almost jelly-like consistency. Its incantation is unknown.
Following a June 1999 Quidditch match between the Pride of Portree and the Appleby Arrows, the losing Seeker accused the opposing Seeker of putting this curse on him as they both closed in on the Snitch.
Behind the scenes
This spell may be a relative of Deboning.