when you are about to leave for vacation and have to defecate , as soon as you defecate in the washroom and leave , you forget to flush. The poor pile of stool stays in the toilet water and marinates for the duration of your vacation and develops a sharp fermented odour from the remnants of the meal you ate on the day you were about to leave.
When you return from vacation and examine your stool , you find it beautifully pickled and ready to be savored.