the wife made some bean soup on sunday, couple of ham hocks boiled down for stock and she used great northern beans and some onion and a couple slices of ham , and opf course salt pepper and some other spices, it was delicious put the left overs in the refrigerator, today we got it back out to put it in the slow cooker, the wife noticed it had kinda gotten bigger in size well kind of foamy and was almost spilling over the sides of the pot, but then she couldnt quite remember how full the pot was when she put it away, so she put it in the slow cooker and as it started to heat up it foamed even more and smelled kind of sour, and she wet her finger and tasted it and said it kind of had a "wine" taste to it..... needless to say we through it out, but I am curious has any one ever had this happen or does any one know what happened? I think it was fermenting but I'm not sure