He-Gassen (Japanese: 屁合戦
Farting Competition or
Fart Battle) is a Japanese fart scroll created during Japan's Edo period by an unknown artist. The scroll has been digitized by the Waseda University Library. This scroll and similar drawings were created in response to increasing intrusion of Europeans in Japan during the Edo period. The art scroll features people, mostly men, in various states of undress farting the direction of other people, animals, and other objects.
References: http://en.wikipedia.org/wiki/He-gassen