Tarantallegra
From Hpwiki
Tarantallegra is the incantation of the "dancing jinx". It causes the legs of the victim to thrash around uncontrollably.
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Usage
Used once by a Death Eater on Neville Longbottom. This caused Neville to kick and smash the prophecy- unknowingly saving Harry and possibly millions of other lives by preventing Voldemort from hearing it.
