The last tetanus shot I had was in 2014, when I was 13. I was net fishing in Sarasota Bay, slipped, and sliced my leg open really deep on a barnacle. I had to get 30 stiches in 3 layers. I remember they gave me a tetanus shot, because I didn't know when my last one had been (I'm sure I was forced to get one younger), and "it's a really deep cut you need it" followed by a bunch of scare tactics. Of course I was young so I didn't know any better. Now I know there is no way I would have gotten tetanus from falling into salt water and cutting my flesh on a barnacle. Thankfully I don't remember having any bad reaction to it.