The routine. Open the kitchen the same, close the kitchen the same. Day in day out (this way you don't miss anything). Sometimes, accidently cutting myself is the highlight of my day.
The same food. Over and over again. Put this on there, add this to that. It's a production line, like working in a factory.
The same music. I'm an advocate of music. I love it in fact. I work somewhere with a fixed playlist of around 30 songs. It bores me to tears. The worst part is, there are some good songs on it, like this: