SpellsCurse
Tarantallegra
The dancing jinx; the victim's legs begin a frantic, uncontrollable tap dance. Malfoy casts it at Harry during the Duelling Club, and it is a crowd-pleaser at every later duel.
In the books
Harry Potter and the Chamber of SecretsChapter: 11
Draco makes Harry’s legs dance uncontrollably during the Duelling Club lesson.