Try to bolt for the door when you are bent over an exam table! Some of my fellow medics had a twisted sense of humor. Come to think of so did I, but as a NCOIC, I tried to be more professional.
You know, it is amazing how many people can't handle getting a shot. You would think that all of the young, buff people serving our country would be above all that. I think I saw more MP's with a fear of needles than any other MOS. Wait, I take that back, I would say that chopper pilots might be at the top. Don't know why.
I have a sister that is a RN and one time she was giving flu shots to her fellow staff members. Right before giving an injection, she normally will say "Stick" to warn her patient of the shot. One of her assistant's, ready to give a shot, turned to a patient, and said "Prick". Without any hesitation, the patient responded back with "Bitch".