The TF Wiki is loaded with amusing snark and Running Gags. In another example, their entry on the Gen 1 Episode "The Gambler" has all the pictures subtitled with the lyrics to the famous Kenny Rogers song.
In the real world, Mark Twain did not know Jules Verne personally. However, he also never had the distinction of fighting a giant mechanical cat from space so make what you will of the story.
There exists a category called "Things That Don't Exist", which included examples such as "True Fan" and "Tighter Shirts". (and although it isn't visible to everyone these days, pages in the category still have a link to it at the end: case in point)
What makes it especially amusing is that the category is redlinked, the implication being that "Things That Don't Exist" doesn't exist.
Even better than that, the first thing on the page is a header with the words "There is currently no text on this page". Followed by the subcategories of Things That Don't Exist, the categories of Things That Don't Exist, and images of Things That Don't exist.
Also in the category of Things That Don't Exist is "scale".
The page for "Prime Suspect" hilariously points out the ridiculous use of Wrongful Accusation Insurance: "In the course of proving Optimus innocent of breaking and entering, the criminal acts you commit include: resisting arrest, interfering with a crime scene, removing evidence from a crime scene, assaulting a police officer, destruction of police equipment, unauthorized access of a police computer system, vandalism, industrial espionage, breaking and entering. What lesson have we learned today, children?"
Everything about their entry on the Gen 1 episode B.O.T. You know you're in for a good read when one of the first things you see is:
This article is about the worst episode of Transformers ever.
The (currently as of Dec. 2013) final note on the episode's Continuity Error section: "This episode was made."
The page for Generation 1 Streetwise has a Transformer-fied version of the Shaft theme song in place of an actual character bio. Even funnier if you imagine it in Issac Hayes' voice. It even inspired the personality of the Generation 2 Redux version of the character.
Likewise, Sureshot's page has a Transformer-fied version of "I'm Too Sexy".
Wheelie's (quite long) page is written entirely in rhyme.
G1 Ramjet is portrayed as being obsessed with toast. This leads to such gems as "TOAST. Represent.".
The article on Transformer romance has an amusing moment which notes the ambiguity of how Transformers reproduce. It's stated that if you want to know more about that you should look at Fanfiction because there is plenty written on the subject. However as the wiki puts it, "doing so will be at your own risk, and TFWiki accepts no liability for any psychological trauma incurred".
After the whole Mayan doomsday prophecy, December 21st is now marked on the "This Day In History" page as "The End of The World. Bummers". It then includes an anecdote that notes "Actual apocalypse may vary".
The page on Christmas claims that everything that ever happened relating to Christmas in Transformers was because of "the magic of Christmas". And free wine.
"The magic of Christmas made Circuit Breaker not kill Jazz."
"The magic of Christmas made Starscream realize that even if he doesn't care, helping people can make him feel... well, he still doesn't really care."
In the article for Beast Wars Neo-exclusive Maximal, Randy, they explain his toy and how it suffers from a crippling case of Gold Plastic Syndrome. The meat, however, is in the text under the image for the toy:
Upon transformation to beast mode for this picture, something went "crack" and a spring fell out, accompanied by plastic dust. This is not a joke.This actually happened to this very toy.
A number of Grimlock's captions and flavour text entries are pretty funny;
""Me fight with all me—"? Me Grimlock not Irish!"
"Me Grimlock no understand what I said."
"Me Grimlock so disappointed me couldn't be at Knott's Berry Farm."
"Some people got collar and cuffs, me Grimlock got collar and brass knuckles."
"Me Grimlock will love you and hug you and feed you and pet you and hug you and love you and call you George."
"One of me Grimlocks are not like the other..."
"Me Grimlock shake fist impotently at Hasbro logo!"
""Grimlock?! What happened to you?" "Me Grimlock not know, but me Grimlock think beer, 3 hookers, and a midget were involved."
"When me Grimlock go clubbin' me make sure to pack extra mace just in case."
"Space. The final frontier. These are the voyages of Cosmos, Autobot deep-space reconnaissance officer. His continuing mission—to observe Decepticon activities. To provide intelligence to the Autobots in their never ending war. To boldly crash where no other Autobot has crashed before!"