Number of news media references to "Polish jokes" in 2008:

105

Source: Vital Stats Nexis Research, 9/10/2009

 
   
  "Little Audrey" jokes become popular:

1930s
Jokes featuring "Little Audrey" became wildly popular in the U.S. in the 1930s, featuring a dim-witted central character who always "laughed and laughed" based on her misunderstanding of a grave situation. An example: "One day Little Audrey and her mother were driving along when the car door flew open and Little Audrey's mother fell out. Little Audrey just laughed and laughed, because she knew that her mother was wearing her light fall suit."
Source: The Game of Humor, Charles R. Gruner,

 
   
 
Pspnyc718 (2007) All Rights Reserved.
"Little Moron" jokes emerge:

Early 1940s
In the early 1940s, jokes involving the anonymous "little moron" were all the rage in the U.S. The jokes focused on the little moron's stupidity, typically starting with "Did you hear about the little moron who..." A few examples: "Did you hear about the little moron who stayed up all night studying for his blood test?" and "Did you hear about the little moron who jumped off the Empire State Building because he wanted to be a smash hit on Broadway?"
Source: The Game of Humor, Gruner,

 
   
 
Dorothea Lange (1939) FSA
Number of Model T joke books in print in 1916:

8
According to many sources, in the first decades of the 20th Century, there were more jokes about Henry Ford's Model T than about any other topic. There were eight books of Model T jokes in print in 1916. One example: "Why is a Model T like a mistress? Because you hate to be seen on the street with one."
Source: Auto Mania, Tom McCarthy,