Do you have a go-to habit when you're writing?

Ana reveals a bad writing habit

I tend to nibble when I am stuck searching for 'right' word or phrase. It's a bad habit, as I don't need any extra calories.

Chewing on my fingernails is limited- only twelve chances every two weeks.

I tie back my hair most days, so searching for split ends is not an option. Nor should it be.

The computer I'm using now does not have Spider Solitare, so one side of my brain can't play while the other searches for the words I want.

I need to get better at phrasing or take up finger drumming. Lord knows I don't want to lie on the floor and do sit-ups.

What do you do when you're writing and you don't know exactly what comes next?