What is your weirdest habit/quirk?

We all have one! Something that you must always do or have a certain way.

For me I have to have the volume on a number divisible by 2. If I can play with the number by adding, subtracting, multiplying or dividing to get it to be 0, its even better.

Also when I eat, I have to eat everything at the same pace so I have one bite of each thing left at the end.