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Give(s) one the willies (= sth arouses nervousness, uneasiness, fear)

"... I was responsible for preparing our students for a horrendously tough Writing exam that the state requires (don't even get me started on state exams!) Anyway, I enjoy teaching English quite a bit, but teaching written composition still kind of gives me the willies . I can write well, but getting it across to young students is hard. It is the most difficult obstacle for some of them to overcome."

Seeing something in the shadows, I suddenly got the willies and ran.

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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. The current sense, however, is not one of grief but of apprehension or nervousness.

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