I work at a call center, and a few years ago I got moved next to this person when we changed management teams. She was a very nice person in general, but for some reason as the day went on her voice would get louder and louder. I was amazed our manager never said anything as it sounded like she was screaming at the people on the phone by the end of our shift. I thought maybe she was just having a bad day or something so I didn't make a big deal out of it.

She kept getting louder though.

It got so bad that I was eventually pressing my hands over my headphones because she sounded louder than my own customers I needed it listen to. After about a week of this I'd finally had it, and I tapped her on the shoulder and asked if she could please try to keep her volume down since I couldn't hear my own callers anymore.

She looked at me like I'd just kicked a puppy or something. She made a HUGE show of gathering up all of her possessions and moving all the way to the other end of our row as far from me as she could get, all in complete silence

I think she actually expected me to come find her and apologize lol but since THAT wasn't about to happen I lived happily ever after never having to listen to her big fat mouth ever again