The most popular instances of Google Humor are the April Fool Jokes. Google had maintained a tradition of perpetrating April fool day hoaxes.
Here is a list of some hoaxes by Google…
April Fool’s Hoaxes
In 2000: Google MentalPlex
Google announced a new “MentalPlex” search technology that supposedly read the user’s mind to determine what the user wanted to search for, thus eliminating the step of actually typing in the search query.
In 2002: PigeonRank
Google reveals the technology behind its PageRank System — PigeonRank. Google touts the benefits of this cost-effective and efficient means of ranking pages and reassures readers that there is no animal cruelty involved in the process.
In 2004: Google Lunar/Copernicus Center
Fictitious job opportunities for a research center on the moon. Luna/X (a pun to Linux as well as a reference to the Windows XP visual style and Mac OS X.It is the name of a new operating system they claimed to have created for working at the research center.
Google Gulp, a fictitious drink, was announced by Google in 2005. According to the company, this beverage would optimize one’s use of the Google search engine by increasing the drinker’s intelligence.
In 2006: Google Romance
On April Fool’s Day 2006, Google Romance was announced on the main Google search page with the introduction, “Dating is a search problem. Solve it with Google Romance.” It pretends to offer a “Soulmate Search” to send users on a “Contextual Date”.
In 2007: Gmail Paper & Google TiSP
Google changed the login page for Gmail to announce a new service called Gmail Paper. The service offered to allow users of Google’s free webmail service to add e-mails to a “Paper Archive,” which Google would print (on “96% post-consumer organic soybean sputum“) and mail via traditional post.
Google TiSP (short for Toilet Internet Service Provider) was a fictitious free broadband service supposedly released by Google. This service would make use of a standard toilet and sewage lines to provide free Internet connectivity at a speed of 8 Mbps (2Mbps Upload) (or up to 32 Mbps with a paid plan).
[via wikipedia.com ]