Wikipedia hoax

Here's a new story about a hoax on Wikipedia:
Irish student hoaxes world's media with fake quote

A student posted a fake quote on Wikipedia about a musician who had just died. Several new sources picked it up and quoted it, before the student announced he had made up the quote. As the article notes, what is scary is that once these more "reliable" sources published it, it gave the quote added credibility. Someone maliciously making something up could then cite those as an authoritative source.