Below is taken from Wikipedia
Email hoax
In 2002 , the spider became the subject of an email hoax claiming that it was a fatal spider found lurking under toilet seats in North Florida. This hoax was a rehashing of an older email circulated in 1999 with similar claims, except under the name "South American Blush Spider (arachnius gluteus[sic])" - literally "butt spider". It has also been found that similar email hoaxes(details of original changed here and there) has been found in other parts of the world claiming that the same thing happened in that country. No such events ever occurred.