I have a pretty strong stomach for the gross and terrible things in life, but I can't stand needles!! Nope nope nope! I tear up at shots and faint during blood draws. I have to have someone drive me to the clinic because I'm K.O.ed for the rest of the day. I frequently have to fast for blood tests so not only do I faint but I also am loopy/cranky after I wake back up. I have to look away or cover my eyes when I see needles on TV.
In case anyone in this thread feels silly for being afraid of needles, I'll share this story about myself. I am deathly allergic to peanuts. Even the slightest amount of cross contamination could result in anaphylaxis (a fancy word for death). A few years ago, I ate something that wasn't labeled as containing peanuts but lo and behold, it had trace amounts. I begin to go into shock and my family is scrambling around trying to find my Epi-pen. My mom finds it and is trying to talk me into laying down so she can easily give me the life-saving shot. I begin to start crying and begging her not to do it because "I'm fine, really!". She ignores me thankfully, and pins me down and gives me the shot. I being screeching and thrash, causing her to cut me with the needle really badly. Thankfully, I got the medication into my system and I survived. I now have a large scar on my thigh from where she cut me.
TL:DR: I have ZERO sense of self-preservation and nearly died because I was too afraid of a tiny needle to take a life-saving medication.