Japanese Fart Scrolls
Taken from the article linked to above...
"The whole scroll, which is called (“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.