In the next volume of the complete collected works of V.Ya. Propp includes his works on laughter, collected together for the first time. The classification of types of laughter, carried out in the - albeit unfinished - book "Problems of comedy and laughter" is recognized as one of the best in modern humanities, and the article "Ritual laughter in folklore" is the link between this, the last book of Propp and his classic dilogy about a fairy tale .