In the 60's, I worked in an office where there were five of us when every one was in town. "Don't wash the coffee pot" was the mantra. One day I went home sick and threw up all night. So whenever it was my turn to clean up, that coffee pot got washed with soap and water. I didn't get sick again, but I didn't drink much coffee again, either. To this day, only one or two cups of coffee is about all I can handle a day.