You'd better hope your kid is actually good at Call of Duty -- or he'll be losing a lot of blood.

Blood Sport is a device that draws real blood every time you're shot in your video game. If its Kickstarter is successful, it'll raise the stakes in shooters forever, and save a whole lot of lives in the process.

Producer Jonathon Root plans to bring the machine to gaming events in Canada, where he'll help collect precious gamer blood to be donated to blood banks across the country.

Here's how it works, according to Kickstarter:

"It’s stupidly simple. Remember the rumble pack? Well, nowadays most video game controllers rumble when you get shot in the game. That rumbling means that an electrical signal is being sent to the controller to let you know you’ve been hit. All we’re doing is re-routing that same electrical signal and using it to turn on the blood collection system."

Whenever the controller shakes, you lose blood. The machine, which is still just a prototype, measures how much blood is actually drawn, "so that Blood Sport powers down before you do."

Root's ambitious project would also pit gaming celebrities against one another to prove they're the best -- or pay in blood.

He hopes to raise $250,000 over the next year to make Blood Sport a reality. So far, backers have donated just over $3,000.