At my first job I worked at a local grocery store as a cashier. Normally the store owner would have a playlist of modern pop that would loop at least once per 8hr shift, and he'd change up the playlist every few months. This sucked a lot, but at the time I didn't know how much worse it would get.
On the closing shift on Halloween night, he started playing his Christmas CD. It was 80 minutes long. On repeat. Nonstop. Until halfway into January. To this day I refuse to listen to any Christmas music at all because fuck that.