You remember the movie Alien Nation? I think it was James Caan as a human cop and Mandy Patinkin as an Alien "Slag" from a ship of escaped enslaved aliens. Sour milk was like alcohol to slags, and there's a scene where Patinkin goes over Caan's apartment and spots the milk which is so sour it has chunks in it. He eyes it, shows it to Caan for permission, kind of like pulling out some fine scotch.
At any rate, today I pulled out the last of a 2 week old quart of skim today to pour it onto my cereal . It had tasted suspicious yesterday so I first poured a little into glass. As I was pouring it, it swirled a bit like it was thickening so I dumped it. Didn't smell awful, but I half expected Mandy Patinkin to knock on my door