An old woman and old man are sitting in the living room watching TV.  A commercial comes on for Viagra.

 

Old man:  (jumps out of his chair and starts putting on his jacket and boots).
 
Old woman:  Where do you think you are going?
 
Old man:  To the doctor.
 
Old woman:  What for?
 
Old man:  I am going to get me some of them Viagra pills.
 
Old woman:  (Sits in chair, thinking.  Jumps out of her chair and gets on her coat and boots)
 
Old man:  Where are YOU going?
 
Old woman:  I am going with you to the doctor.
 
Old man:  What for?
 
Old woman:  If you are going to start using that rusty old thing, I'm getting a tetanus shot!