Either Dead Space game should prove sufficient to frighten you into never turning off the lights, going to church or becoming an astronaut again, but both together? That's certainly worth $10.
Each game is on sale for $5 tonight on Steam. That's 75% off their normal, already-low prices.
The games follow Isaac Clarke as he battles grisly, mutated corpses and violent, ruthless religious zealots across an enormous mining spaceship and a moon of Saturn.
If you haven't played either game, you had better hurry and take advantage of the sale, as the games are back to their normal prices tomorrow. Tell us your thoughts on Steam sales and Dead Space in the comments or on Twitter.