Japanese Fart Scrolls
Taken from the article linked to above...
"The whole scroll, which is called He-Gassen (“The Fart Battle”) is just about people farting. Farting at other people, farting at cats, farting off of horses, farting into bags; just farting everywhere."
Lucky for us, there was also a video produced discussing these infamous 'fart scrolls.' [Edited to add that while the video is somewhat of a joke, the actual scrolls, best I can tell, are legitimate artifacts]
Hope this weekend has been good for you.