Wikipedia maintains a catalog of Bad Jokes and Other Deleted Nonsense (BJAODN) -- it's the best of the worst stuff added to Wikipedia. Here, I present 11 excellent pieces of dumb humor that was deleted from Wikipedia...but then retained on a best-of page, because it's just that
1. Water on MarsOn April 1, 2004 a Wikipedia user discovered shocking proof -- photographic proof -- of water on Mars. The photograph was posted to the heart-laden article "♥Water on Mars♥" and the image is still retained (Creative Commons license and all) on Wikipedia, though it carries this bold warning: "This is a very bad joke. We believe it to be one of the most humorous examples of the Wikipedia community's work."
A Wikipedia editor commented: "Evidently, there is also glass and a plastic wrapper and now MY JAWS!"
2. The Cross-Eyed Teacher
Wikipedia's Pupil page had this section inserted:
Q. Why was the teacher cross-eyed?
A. Because she couldn't control her pupils.
Wikipedia editors followed up with:
[edit: This is incredibly not funny.]
[edit edit: That's why it's funny.]
A little Physics humor:
The Coalition to Prevent Gratuitous Misuse (CPGM) was organized in 1901 to protest the (then) common misuse of the word weight to mean mass. The movement gained momentum (defined as the vector product of its velocity and mass) when SI was officially adopted in place of metric system, which no longer carried its weight. This movement captured the imagination of the mass of scientists througout the world, although the general public remained unmoved, since a body at rest tends to remain at rest (see Newton's Laws).
this should never have been deleted, it is a work of genious (edit: I think you mean "genius," genius.)
4. Y0-Y0 Ma
Y0-Y0 Ma is not to confused with Yo-Yo Ma, the famous cellist. Apparently Y0-Y0 is a nonhuman actor. Okay, just read this glimpse into some Wikipedian's madness (and/or sense of humor):
Y0-Y0 Ma plays Yo-Yo Ma, who lives in the human universe. Y0-Y0 Ma was born on Availy 32, 123456789, so he is 40 years, 13 months, 5 weeks, and 8 days old as of Verely 0, 987654321. He was born in Culombos of District, Wishongtan, Amerigan Union of Soviet Capitalist Tribes.
About the actor
Y0-Y0 Ma is an actor who enjoys playing nonexistant creatures. Of all the beings he had played, his favorite are the humans. He enjoys playing them, because they aren't that sophisticated, so he doesn't have to be. Of course, no one understands what he's saying when he is acting, because all the actors speak in Humanish language for "authenticity". His favorite character, Yo-Yo Ma, is a parody on his name.
Y0-Y0 Ma currently resides in Los Diablos, Jaba Nacilofria, A.U.S.C.T.
5. A Tip on Cow Tipping
This briefly appeared on the Cow Tipping page (emphasis added):
If you succeed in tipping a cow only partway, such that only one of its feet is still on the ground, you have created lean beef. Such a feat is well done. Naturally, being outside, the cow is unstable. When it falls over, it becomes ground beef.
An editor then inserted: "Such quality of humor is rare."
6. The Drummer Joke
"Someone who hangs out with musicians." (Briefly appeared as a definition on the Drummer page.)
Presented without comment:
Th'u~nks as a religion, was born when two prophets — known as the Two Great Piephits by practitioners of the religion — discussed the greatness, and spiritual meaning that can be found in the humble pie, particularly the pukka (pronounced "puck-ah") variety. Currently it has believers in countries around the globe.
In the year 2006 CE the Piephits were discussing the benefits of the pie over other pastry based savoury foods, when they were struck by a joint moment of revelation. This moment, known as The Pievation, was believed to be the moment when the Master Baker showed the true meaning of pastry, and consequently life to the Two Great Piephits. From this they jointly established the main underlying tenet of the religion, that of B'heegery and thus Th'u~nks was born.
8. Alternative Rock/Missing the Point
The page for Alternative rock featured this alternate definition, including an apparently sincere attempt by an editor to make sure it was properly sourced:
Alternative rock is the name given to one stone when you're looking at another stone. The term was coined by photographer Edwin Blastocyst when looking at one stone and speaking about another, oddly enough.
The quote from Edwin Blastocyst needs to be verified.
(Note: I'm not sure Blastocyst was a real person, considering that "blastocyst" is a stage of embryonic growth.)
9. Voltaic Democratic Union
The Voltaic Democratic Union, which is actually a thing, started out as a "stub page" (starting point) featuring the text: "Shocking, just shocking!"
10. Baby Catapult
From the now-deleted "Baby Catapult" page:
The Baby Catapult is an invention of insane genius Maxwell Q. Infantlauncher of Indianapolis, Indiana. It is not meant to launch actual infants; it is meant to launch Cabbage Patch Kids and the sort. The goal is for them to go 100 feet in the air, and 500 feet along the ground. The catapult should be finished by mid-2004.
An editor noted: "I, for one, am disappointed."
11. C is for Cookie
This mini-essay on the rhetorical form of Cookie Monster's discourse was added to the page C is for Cookie and then, sadly, removed.
C is for Cookie can be regarded as a case study in persuasive oratory, emphasizing the emotional aspect of public speaking. Cookie Monster builds excitement by answering his opening rhetorical question, "Now what starts with the letter C?" with the obvious reply, "Cookie starts with C!" He then challenges the audience, "Let's think of other things that starts with C," before quickly replying, "Oh, who cares about the other things?" casually dismissing a whole range of other possibilities as irrelevant. Thus, having ostensibly come for the purpose of covering the letter C in its entirety, Cookie Monster has already focused his agenda exclusively on cookies, employing the classic bait and switch tactic. Several times in his presentation, Cookie Monster emphasizes what appears to be the central thesis of his remarks: "C is for cookie, that's good enough for me!" The appealing rhythm of this slogan appears designed to entrance listeners, swaying their emotions and making them instinctively want to chant along with him. After rousing the crowd, Cookie Monster systematically lays out the logical underpinnings of his pro-cookie ideology, comparing cookies to round donuts with one bite out of them and to the moon during its crescent phase, in essence using a straw man argument that implies his opponents would advocate the superiority of these competitors over cookies. In this sense, Cookie Monster may be proposing a false dichotomy representing cookies as the only viable choice to a group of obviously inferior alternatives. But before the audience has a chance to catch on, Cookie Monster launches into another round of repetitive chanting, "C is for cookie, that's good enough for me, yeah!" as young children sing along. Here, Cookie Monster uses a propaganda technique strikingly similar to that employed in George Orwell's Animal Farm by the pig Napoleon, who trained the farm's sheep to bleat, "Four legs good, two legs bad" on his cue. Cookie Monster then adds visual stimulation to his discourse by chomping into a large cookie, concluding his remarks with "Umm-umm-umm-umm-umm" and other chewing sounds.
Another addition was an entire section titled Other Things Starting with the Letter C, including Carrot, Crabcakes, and Cucumber.
Way, Way More
There's a whole page of this, and it includes links to several more "best of BJAODN" lists. One of my favorites in those extra lists is a spoiler-filled plot summary of The Very Hungry Caterpillar (with philosophical commentary).