“Blood Sport raises the stakes of gaming, by making it so when you lose blood in the game, you lose it in real life, too.”
https://www.kickstarter.com/projects/1246820613/blood-sport-the-ultimate-in-immersive-gaming
So apparently, back in 2014, some guys wanted to develop a video game peripheral that sucked your blood intravenously based on various game events. They thought it could be used to increase blood donations. This is literally the stupidest thing I have ever seen people try to develop.