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A villain of the Batman universe, first appearing in Batman #1 (1940). He is considored to be the Caped Crusader's arch nemesis. His title is the "Clown Prince of Crime".

The Joker's real name is unknown, though according to the first movie starring Nicholson, it might of been Jack Napier. The catalyst of his insanity has different tellings:

Originally a failed comedian, coerced into crime after the deaths of his wife and unborn child. Disguised as the "Red Hood", he failed to steal from Monarch Playing Cards. Running from Batman, he fell into a waste pool by the Ace Chemical Processing.

Surving the accident, it coloured his hair green, bleached his skin white and deformed his mouth into a red smile. Using eccentric weapons like acid spilling flowers and static joy-buzzers, he sadistically amuses his victims before he murders them. Other schemes include bribery and terroism.

The sidekick and former pyschiatrist of The Joker is Harley Quin (a.k.a Harleen Quinzel). She accompanies and supports her love interest in his crimes in Gotham City.
"Do I look like I'm joking?"
The Joker by Anonymous December 18, 2004

The Joker Blogs 

The most epic online version of The Joker. It takes place in Arkham Asylum after The Dark Knight. It's a Youtube series. Look it up on Youtube or visit the website to check it out. Scott McClure plays The Joker.
Dude, I just watched The Joker Blogs! It was awesome!
Can make a pencil disappear
Do what The Joker did on that pencil
The Joker by Patrick_Bateman August 14, 2008

The Joker Blogs 

A YouTube series that follows the events of The Dark Knight involving Patient #4479 undergoing therapy at Arkham Asylum, under the supervision of his psychiatrist Dr. Harleen Quinzel. The series is known for its comic characters, intricate storyline, and dark humor. Search for The Joker Blogs on YouTube or visit www.thejokerblogs.com
Have you seen the latest episode of The Joker Blogs? It was epic!
The Joker Blogs by the'friend' July 16, 2009
The most fantastic villain to ever be drawn. He's insane, but totally hot, and incredibly amazing.He is a fucking genius and is always ahead of the curb.
The Joker by epicmiffinbits January 24, 2009

Rudy “The Joker” Giuliani 

The Mobster in Chief’s pet nickname for his current personal attorney-fixer since Rudy has been, just like Batman’s Joker, hired by New York City mob bosses, has a deep desire to upset the social order, a warped sense of humor, and is motivated by his own inner chaos, inhumanity and love of anarchy.
It’s clear that Rudy “The Joker” Giuliani is the newest trumpuppet and desperate fall guy for the Flag Fucker in Chief as we watch him finally begin to circle the drain and head for the comfy Otisville celebrity slammer in New York to join his good old buddy, Michael Cohen.