Jelly-Legs Curse

"Jelly-Legs Curse: Point your wand directly at your enemy and shout Locomotor Wibbly!"

- Vindictus Viridian, Curses and Counter-Curses.

The Jelly-Legs Curse, also known as the Jelly-Legs Jinx (Locomotor Wibbly) is a spell that causes the victim's legs to collapse.

This curse is covered in Curses and Counter-Curses by Professor Vindictus Viridian.

Known uses

 * Hermione Granger used this spell on Harry Potter while he was practicing the Shield Charm for the Third Task of the Triwizard Tournament.
 * Vincent Crabbe was hit with this jinx, in combination with Furnunculus, by Harry and George Weasley, causing little tentacles to sprout all over his face.

Behind the scenes

 * The Jelly-Legs Jinx seems to share some similarities with Tarantallegra, although the effects as described are slightly different; Tarantallegra makes the victim's legs thrash about uncontrollably, whereas this spell makes their legs shake.
 * In the GBC video game adaptation of Harry Potter and the Philosopher's Stone, this spell is used to immobilize the opponent until they are hit with another spell.
 * When asked whether anything in the series reflects any of her childhood fantasies, author J. K. Rowling says, "...who wouldn't want to be able to use the Jelly-Legs Curse?" . This seemingly confirms that it is a curse, rather than a jinx.
 * There have been various mistranslations of this spell's name, such as "Jell-O Legs", "Jam Legs", "Broken Legs" and "Twisted Limping Legs", in the Chinese, Japanese and Vietnamese versions of the books

Appearances

 * Harry Potter and the Philosopher's Stone
 * Harry Potter and the Philosopher's Stone (video game)
 * Harry Potter and the Goblet of Fire
 * Harry Potter and the Half-Blood Prince
 * Pottermore