This is it. The day I bleed for mankind. Now, in case you are wondering if I have somehow gotten myself involved in some demonic ritual involving bloody human sacrifices, let me assure you that there is no need for such panic. It is only a blood donation and the most they can get out of me is probably a pint of blood. I decided to go with a colleague of mine, who suffice to say, has done her fair bit for the blood bank.