I'd go back to work and start pushing buttons, see just how far I could push it before they start trying to get rid of me.
Little things, parking in the bosses car space, very long lunches, talking loudly on my mobile for hours in the office etc. Maybe some eccentric clothes!
How would you behave at work if you did not need to be there!
I fantasise about not having an alarm clock - just to be able to wake up every day as nature intended. I'm not a particularly late sleeper, and I'd usually be up before 9 at weekends, but wouldn't it be nice never to have that 'beepbeepbeep' again?