What to be for Halloween?

Every year my company does a Halloween costume contest in which I am 'highly encouraged' to participate (the joys of working for a tech company).  My first year I dressed up as a pregnant nun which was hilarious because I was in fact pregnant and it was my 3rd day at work as the company's first lawyer.  It helped set the tone for how my relationship would go with the company.  Now I've got to top that in some creative way and I'm drawing a blank.  So dear readers I'm sending out a plea for help.  Have a work appropriate suggestion?  Leave it in the comments or email me.