The first time I went to the clinic, they took a blood sample from one arm and pumped the other full of Hep A and B vaccines. Then I fainted. Thankfully, I was being treated by someone with the build of a shot-putter, and he caught me!

(While I no longer mind needles [so much], I really hate dental injections simply because the drugs hurt as they go into the gum. It's the pressure change, I think.)