I worked at BK in a dark time of my life. It was physically and mentally demanding. You had to memorize the order of every ingredient of every burger and assemble them in the least possible time and there were themed burgers or some shit so you had to re-learn from time to time. Wasn’t exactly un-demanding mentally. From time to time I had to re-arrange big packages in the cold storage for hours. Fun times. Very hectic and demanding job.