Query (3rd and final try): Origin of "give/have the willies"

[W Brewer]

FWIW, <<According to Heinrich Heine, the Wilis are <maidens who have died
before their wedding day, because of faithless lovers.> They rise from
their tombs at night to seek vengeance, and if any man is unlucky enough to
encounter them, he is forced to dance till he drops dead from exhaustion.
This legend formed the basis of the popular 19th-century ballet Giselle.>>
http://www.aaronshep.com/stories/011.html

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