so this is a sad story. i made a wonderful brew, porter-like beer, made the wort, cooled it, aerated it and put in the fermenter. Now, I left it in there for 3 days without pitching yeast. the reason was i ran out of yeast without taking notice. so i got my yeast today and wanted to pitch it in, BUT i heard the airlock bubbling!! so i opened up the fermenter and a really foul smell came out and bubbles on the top.. what the heck just happened??? i sanitised everything! snif snif snif ...