tarantism (TAR-uhn-tiz-uhm) noun
An uncontrollable urge to dance.
[After Taranto, a town in southern Italy where this phenomenon was experiencedduring the 15-17th centuries. It's not clear whether tarantism was the symptomof a spider's bite or its cure, or it may have been just a pretext to dodge aprohibition against dancing. The names of the dance tarantella and the spidertarantula are both derived from the same place.]
-Anu Garg (http://wordsmith.org/words/tarantism.html)