Linguists Elena and Alexey Shmelev wrote this article on the eve of the anniversary of Andrei Anatolyevich Zaliznyak. It is well known that Zaliznyak is an excellent teacher who understands humor and knows how to joke. His speech on Russian cursing is known, and those who come to his traditional September seminars at Moscow State University cannot resist his charming smile and the enthusiasm with which he talks about the birch bark letters he found.