Does spoiled milk make any ingredient? Bear with me here,

My roommate insist that she wants to keep her spoiled 2% milk in the fridge, it's been 1 month! That thing look disgusting. To my knowledge, you don't use rotten milk for anything/ingredients. So before I throw it out, is there something I don't know of that people use rotten milk for?
The only thing that is even remotely possible in my mind is to use it akin to buttermilk or sour cream (which are intentionally fermented products) in baking.

However, since the culture that fermented the milk was uncontrolled, I would not do so.  I recommend discarding.