I gave blood for a number of years then had a bike smash and ended up having a 5-pint blood transfusion. Femur/marrow recovery prevented donation for a number of years.
Then, out of the blue, I started getting begging letters. Pleading for my blood and platelets due to being O neg. After six months of this I went again. After waiting in the queue for half an hour, I asked them about something that didn't make sense in the questionnaire.
It turned out that, "Sorry, if you've had a blood transfusion since 1980 then you can't give blood due to the risk of passing on CJD."
Eeee, I went bleedin' crackers
"YOU MEAN TO TELL ME THAT I CAN'T GIVE BLOOD BECAUSE I MAY PASS ON A DISEASE THAT, IF I HAVE IT, WILL HAVE COME FROM YOU IN THE FIRST PLACE?
I continued:
"ALSO, IN THIS AGE OF COMPUTERS, HOW COME YOU ARE SENDING BEGGING LETTERS TO SOMEONE WHO THE SYSTEM WOULD SHOW CANNOT GIVE BLOOD?"
"REMOVE ME FROM YOUR RECORDS AND DON'T CONTACT ME AGAIN YOU BUNCH OF IDIOTS!!!"
Screw 'em, they ain't getting another drop out of me.