Bob Dunn (cartoonist)

For other people with the same name, see Robert Dunn (disambiguation).
Bob Dunn

Bob Dunn (March 5, 1908 – January 31, 1989) was an American cartoonist, entertainer and gagwriter who drew several comic strips. In addition to his own strips, Dunn was known for his work on Jimmy Hatlo's Little Iodine and They'll Do It Every Time, and is said to have invented the modern knock-knock joke in 1936.