You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What DC Comic book did the Joker originally appear in 1940?" whose answer is Batman.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Joker first appearance 1940
Useful Output:

Doc 1: Today marks the first appearance of the Joker back in 1940 in Batman issue 1! Happy anniversary to the clown prince of crime!
Doc 2: Today in 1940 the Joker made his first appearance in BATMAN number 1 - created by Bill Finger, Bob Kane, & Jerry Robinson. Joker.
Doc 3: The Joker debuted in Batman #1, the Spring 1940 launch of the Dark Knight's dedicated comic-book series; it also revealed the superhero's origin
Doc 4: The Joker has come a long way from his first appearance in 1940; that is reflected by the modern-day Joker in "The Joker" movie of 2019.
Doc 5: The story itself retells the first appearance, with details of the red hood story introduced to give the Joker some motive. Brubaker breaths