| Original YTMND:|
The Medieval fad recreates other fads using elements from the Bayeux Tapestry, a famous 11th century embroidery depicting William the Conqueror's victory over the Anglo-Saxons at the Battle of Hastings.
The fad was made possible by the Historic Tale Construction Kit, a Flash website that allows users to drag and drop pictures and text from the Bayeux tapestry into their own custom-designed scenes. The resulting combination of pictures and text resembles the most basic form of a YTMND, perhaps explaining the fad's appeal to YTMND users.
The text in Medieval YTMNDs is usually a fad catchphrase rewritten to resemble Early Modern English, often to the point of absurdity. ("I hath it with thineon thine mother trysting flying barge!")
To complete the medieval setting, virtually every site in the fad uses the same song: folk singer Heather Dale's recording of the 15th century Christmas carol "This Endris Night." The popularity of the fad earned "This Endris Night" a spot on YTMND - The Soundtrack Volume 1.