I have to admit that I found this NYT article interesting.
When half a dozen students in Neil Waters’s Japanese history class at Middlebury College asserted on exams that the Jesuits supported the Shimabara Rebellion in 17th-century Japan, he knew something was wrong. The Jesuits were in “no position to aid a revolution,” he said; the few of them in Japan were in hiding.
He figured out the problem soon enough. The obscure, though incorrect, information was from Wikipedia, the collaborative online encyclopedia, and the students had picked it up cramming for his exam.
Into the shower and out the door! Woo!