Wikipedia
Horsemaning
Horsemaning (or horsemanning) is the act of posing for a photograph in such a way that the subject appears to have been beheaded, their head resting on the ground or on a surface. Such photography was reportedly a fad in the 1920s. The practice derives its name from the Headless Horseman, an evil character from Washington Irving's short story " The Legend of Sleepy Hollow".
Horsemaning saw a revival in 2011, along with other photo fads such as planking and owling. All three were considered among the top 10 Facebook sensations of 2011. and a series of horsemaning photos began trending on sites like Buzzfeed as people were inspired to recreate the original fad.