Arachnophobia....

http://www.telegraph.co.uk/news/newstopics/howaboutthat/4787642/Zoo-launches-spiderphobia-course.html

And, for an opposing viewpoint:
http://www.youtube.com/watch?v=zJKJ_7LszU0

(I will point out that this film features one of the first screen appearances of Clint Eastwood...)