I remember after joining a nameless company here in the UK and filling out all the paperwork. Someone from HR came over to me to explain I had missed filling out a form. I asked which form and they replied the Working Time directive opt out. I explained that 48 hours was more than enough time to do my job and that I had deliberate not signed it. They looked at me confused and then went away. It annoys me when they assume you should fill it it like that though.