What is the main source of humor in this comic strip?
Source:https://d1ejxu6vysztl5.cloudfront.net/comics/garfield/2017/2017-05-21.gif.
Access on 30 April, 2018.
Source:https://d1ejxu6vysztl5.cloudfront.net/comics/garfield/2017/2017-05-21.gif.
Access on 30 April, 2018.