Most vile cup of coffee I ever made was in 1979  when my percolator went berzerk and reduced a whole pot to an an ounce or two of bitter meth. I downed it in a single gulp since I was cramming for a final in some ridiculously difficult class, and while catching a couple hours sleep in the wee hours of the morning had one helluva seizure and when I got to the class for the exam had amnesia and couldn’t remember a single thing. I turned in an empty paper and flunked the course. Never managed a cup of coffee like that again.