Why we need a Tetanus shot...

 An old man in his mid-eighties struggles to get up from the
couch then starts putting on his coat. His wife, seeing the unexpected behavior, asks, "Where are you going?"
       
        He replies, "I'm going to the doctor."
       
        She says, "Why, are you sick?"
       
        He says, "Nope, I'm going to get me some of that Viagra
stuff."
       
        Immediately the wife starts to get out of her rocker and
begins to put on her coat.
       
        He says, "Where the heck are you going"?
       
        She answers, "I'm going to the doctor, too."
       
        He says, "Why, are you sick?"
       
        She says, "No, but If you're going to start using that rusty
old thing, I'm getting a Tetanus shot."