What are some rituals/habits you follow when working?

Some people I know must have music blasting with their headphones, some have to have a certain kind of food like pringles or cheetos. Before I start working, I always make sure I have at least 6-7 cans of green tea and a bag of honey dijon kettle chips before I begin working.

Anyone else have a similar ritual/habit that you follow when you're about to work for hours?