Sentence:  Certainly one of the most stressful jobs in contemporary society is that of the air traffic controller. . . . This pressure, combined with the ever-present fear of causing a crash or collision (known with studied casualness as an "<WSD>aluminum shower</WSD>"), places controllers under tremendous stress on the job. 
Meaning of the word marked with <WSD> tags:  The result of a midair collision of two aircraft.