He-gassen

He-Gassen (Japanese: 屁合戦, literally: "Fart competitions"), or Houhi-Gassen (放屁合戦), are titles given to a Japanese art scroll, created during the Edo period (1603–1868) by an unknown artist or several unknown artists.
The scroll depicts various scenes with one peculiar characteristic reoccurring throughout the scroll: at least one character is having a bout of flatulence directed against the other characters.
The scroll has been digitized by the Waseda University Library.