>I go get my flu shot every year. Why not? It's free

A lot of these decisions people base on their anecdotal experiences with it (right or wrong), including myself. I don't get it because the people in my life who do get them sometimes get really sick for a couple of days after getting it, and it still seems to be 50/50 on whether they still end up with the flu that season. Meanwhile, having had the flu a couple times in my life I know that it sucks but it's still only a couple of days of misery which I would likely get with or without the shot.

I'm also a healthy adult though, and I imagine my calculus will change as I get older and more vulnerable.