I get a flu shot every year. Working in the hospital, it's encouraged that we do and the hospital, of course, will vaccinate us for free. So Friday, while at work, I got my flu shot.
Now, let me tell you a little something about giving/getting a vaccine. They're given in the muscle tissue, most often in the upper arm. When giving an IM injection, you jab (my technical term) the needle into the muscle, and then pull back on the plunger slightly to make sure you're not in a blood vessel. Then push the med/vaccine in, and pull straight out. Most people have a little spot of blood where the needle went in. Normal.
Okay. So I go downstairs to get my flu shot. The nurse who gave me the shot was very nice and gave it expertly. So she pulls out the needle and there's a little drop of blood. She kinda stares at it in horror and I tell her "I always bleed a little after a shot".
And she says (this is priceless) "On purpose?"
Yes. On purpose. I have amazing control over my circulatory system and can make myself bleed at will. It's really quite awesome.
And she's a nurse.