I'm confused. This morning, I made coffee. Water CAN'T go sour, and I've never heard of coffee grounds going sour....my cream is perfectly good - I smelled it from the carton. BUT I poured it in my coffee, and immediately this horrible sour milk smell arose from my previously delectable smelling cup. WHY!!?!? There is no history of coffee making cream go bad...I don't think it's chemically possible.
So WHAT happened!?