Drawing on ethnographic data, this article analyses employees’ cultural appropriation of AI systems within delivery platforms and manufacturing in Germany. Cultures of technology appropriation in workplaces emerge in a context of domination. Deviant forms of appropriation thus constitute a form of organisational misbehaviour for which employees must assume repercussions. Employees’ criticism of AI systems at their workplaces therefore differs strongly depending on whether management is present or not. In those cases studied here, the dysfunctionalities and disciplining functions of AI systems were criticised openly in settings where management was absent, while in situations of co-presence this criticism predominantly took the form of subversive humour. Systematically, employees ascribed absurd identities to technologies; this functioned as a low-risk form of criticism and provided continual mutual affirmation of a shared critical stance towards specific technologies. It thus established a critical organisational technoculture. Such practices of subversive humour are indicative of the critical lucidity of employees, but also signify a relative inability to influence workplaces and their technological infrastructures. In some cases, however, subversive humour laid the cultural basis for more practical forms of technological misbehaviour including the manipulation of algorithms and even sabotage.