When I was a child I was extremely scared of needles.
When I grew older I still didn't like them and tried to avoid them when possible (I only volunteered once for a sample of blood so that my genetically code could be examined for the purpose of finding some donator of bone marrow for someone who suffered from leukemia).
Now two years back when I was at my university of applied sciences (what a term in English:rotfl

we had the Red Cross coming to us for blood donations. I read a pamphlet with the announcement and thought to myself "well, they can take all the blood they want, but definitely not mine...".
On that special day I came down from our canteen after having lunch and was approached by a nice fellow student who asked me with this irresistible smile to donate blood. I immediately said that I hated needles and wasn't going to do it... But she kept talking to me and all of a sudden I felt like a total whimp standing in front of a girl and telling her to be afraid of a needle.:rotfl: So I finally gave in and donated half a liter of blood... I survived.

Well this is now slightly more than two years ago and by now the Red Cross received a total of 4.5 liters from me in 9 donations. I still don't like the sting of the needle (the ones for blood donations are a bit bigger than the normal ones for drawing samples

) but I don't mind it anymore that much, and it is a good feeling to know that one has helped others to survive.