I have to give blood samples three time a year, nowadays there's no drawing back a plunger, they flick a lever, & vacuum does the rest, in around two seconds the cylinder is full of dark red blood, I have two lots taken each time, I don't particularly like having it done, but it has to be done for the rest of my life, so I have to accept it!
In the Air Force, they were keeling over in droves when we got our first innoculations.