This study concentrates on the potential of mass culture texts to impose specific metapragmatic stereotypes (Agha 2007) through humour on the wider audience. Metapragmatic stereotypes constitute speakers’ internalized models of how language should or should not be used; such models guide speakers’ own language use and enable them to make evaluations about their own language behaviour or that of others. In this context, the author explores the dominant metapragmatic stereotypes for the interpretation and perception of humorous mass culture texts. To this end, an analysis is presented of a humorous Greek TV advertisement of a telecommunications company. Drawing upon Coupland’s (2007) conceptualization of style and the General Theory of Verbal Humour (Attardo 2001), it is shown that humour reflects, sustains, and reproduces the dominant metapragmatic stereotypes of linguistic homogenisation and monolingualism (Blommaert & Rampton 2011). Then, an exploration follows of how the audience perceives the representation of stylistic choices in mass culture texts and,more specifically, in the analysed advertisement. Findings suggest that humour stigmatises specific styles, and that the audience perceive the respective (and reinforced through humour) metapragmatic stereotypes as guidelines for “correct” stylistic use. Furthermore, it seems that through humour, such stereotypes usually go unnoticed in mass culture texts and may even become naturalised, as they are framed in a “trivial” and “non-serious” manner.