Pragmatics offers several perspectives in discussing humor, including cooperative principles. Cooperative principles offer options for researchers in discussing how listeners will generate an implied meaning, thus creating the humorous potential in an utterance (Cutting, 2002; Grice, 1989). Despite there are studies on cooperative principles of humor using various media, there is still a lack of studies discussing cooperative principles in British comedy television shows. Therefore, to fill this gap, this paper attempts to analyze the cooperative principles found in a BBC 2 comedy television show, Inside No. 9. Furthermore, the paper also reveals how the flouting of the principles creates multiple forms of humor, adapting the categories of humor by Martin and Ford (2018). This descriptive qualitative research chooses the Series Four of Inside No. 9 as its subject, with the consideration of the critically-acclaimed receptions, diverse themes, and language aspects of the show. To obtain the data, the researchers use an open-coding technique to categorize the data according to the four flouting of the maxims (flouting of the maxim of quality, quantity, relation, and manner) and the forms of humor (irony, satire, sarcasm, overstatement and understatement, self-deprecation, teasing, replies to rhetorical questions, clever replies to serious statements, double entendre, transformation of frozen expression, and pun). The data are taken from the episodes and scripts of six episodes in the fourth series in Inside No. 9. Results show that all of the types of flouting of cooperative principles were found in the selected season, which covers the flouting of the maxim of quality, quantity, relation, and manner. Based on the findings in most episodes, the flouting created by the characters diverges the serious conversation into a more humorous atmosphere. However, several types of humor are not found in the maxims' flouting due to the storyline and British comedic style aspects.