Christmas carols. Being forced to come back to a retail job over the Christmas rush a little over a week after my brother was found dead on the floor outside my bedroom :)
The boss there had a very personal bone to pick with me, made it clear she didn't even have to give me any bereavement leave since I was part time, and when a customer went on a Mach 4 tirade because I wasn't smiling hard enough (not kidding), she backed them up and threatened to fire me in front of everyone.
12hrs+ of this every day. I preferred working by myself in back because people would leave me the fuck alone to do my job, but it turns out it was also useful for intermittent off-camera crying!
To this day, 13 years later, I can still tell you the exact playlist that was on the radio. That was when The Fray's How to Save a Life was still big and I used to really like that song, but I can avoid it now a lot easier than I can avoid "I'll Be Home for Christmas."
It got me forcibly stopped by the police once, when I couldn't take it anymore, ran out of the store, and the owner assumed I stole something. I really just don't leave the house after October.