Who would have thought that an iPad retina LCD panel can be used as a PC monitor with a simple handmade adapter? I may not have been the first one to figure it out, but I was the first one to publish how to do it, which caused quite a stir and launched a bunch of products and crowdfunding campaigns.
Original writeup
https://emerythacks.blogspot.com/2013/04/connecting-ipad-retina-lcd-to-pc.html
https://emerythacks.blogspot.com/2013/05/the-retina-saga-continues.html
Featured on
https://hackaday.com/2013/04/22/connect-a-retina-display-to-a-regular-computer/