The aim of this article is to analyze the specific character of grammatical categories present in humor. One of the most important sources of comicality in the Author’s view is transgression of the logical relations and grammatical constraints through, for example, making use of variation in the paradigm following the coordinating conjunction or preposition, taking advantage of the different senses of the reflexive form of the verb, utilizing vagueness of the distinction between predicative and support verbs. The Author also emphasizes the importance of the disturbance in the situation of communication.