Gives one the willies - arouses nervousness, uneasiness, fear
The origins of this phrase are shadowy and possibly go back a long way. It has been suggested that the word willies comes from 'willow tree', of which the word willy is an old form. The willow has long been a symbol of grief and mourning, and there are many references to it in English literature. The saying 'She is in her willows ...' was used of a woman who had lost her lover or spouse. More than one authority has pointed out that Giselle, the heroine of the 19th century ballet of that name, is possessed by the Wilis, or spirits of beautiful young girls who have died before their wedding day and who dance to express their anger at death. The current sense, however, is not one of grief but of apprehension or nervousness.