This is small vanilla shake from Burger King, and it's 3 weeks old.
Now as a disclaimer I want to say that yes, in general I shouldn't have had any trouble finishing a shake, but it was really late and I just wasn't in the mood to stuff myself any further after downing my burger. So, I decided to hang on to it and see what happens.
Well, after about 30-40 minutes of of sitting on the counter and occasionally stirring the shake (and breaking open the thin plastic cup because I wasn't being careful), my "shake" was ready to try once again.... emphasis on try, because I only took a few sips to confirm the fact that this liquid had gone back to tasting like shake mix and not a "real" shake. All the air is gone so it's very flat, kind of like weird tasting milk. Oh well, I tried right?
So, the big question is, have you tried to save a shake? if so, have you had better luck than me?