I was asked a question like this when I went in for a hearing evaluation this week.
When I was in my late teens, I took the first job I could find. I was hired on as a gas station attendant. In Oregon, you are not allowed to pump your own gas, only the attendants do that. I mention this because in many states, the stations are self service.
It was only my second or third day on the job when a man drove up in a fancy white low rider with tinted windows and told me to "Fill it up". I repeated what was said to me to make sure I had the right information. I set the pump handle onto the tank and clicked the lever open to auto fill while I went and served the next customer. After tending to them, I went back to check on the tank with the man who wanted the fill up. My boss was waiting on him, glowered at me and waved me off to help someone else at another pump.
Once things slowed down at the station, my boss came over and fired me. He said that the customer had asked for only five dollars worth of gas. I tried to explain the conversation I had with the customer, but he just didn't want to hear about it.
Have you ever lost a job because you either couldn't hear or something or misunderstood something that was said? I wonder how often this has happens to hard of hearing and deaf people.