The Jedi Census Phenomenon

In 2001, a strange, rebellious movement began via email. People were encouraged to put "Jedi" on their census forms under religion. Most of these emails claimed that a certain number of people writing Jedi on their census forms would make Jediism an official religion. This is only partially true. It does not make it an official religion according to the government. It simply means that the census bureaus in country's where this would take place would be forced to allow Jedi as an option or find some other way of classifying these people. As it turned out, it worked and census bureaus had to figure out the problem.

Hundreds of thousands of people in the U.K., Scotland, Canada, Australia and New Zealand marked themselves down as Jedi. Jedi had the fourth largest number of followers according to the census in the United Kingdom. Just why so many people marked their religion down as such is not entirely clear. It may have been in protest to the census itself or in protest to having to mark down a religion. To some, it may have just been a joke. Whatever it was, it has made an impact on census' in English-speaking countries ever since.

Source

Jedi Makes the Census List, news.bbc.co.uk/2//hi/uk-news/1589133