Brown Town

Lab tech goes into a treatment room to draw blood on an elderly gentleman.
     
Lab:                 Sir, can you tell me your full name?
Patient:            John Brown.
Lab:                 Where are you from?  (making small talk while setting out his venipunture
                          supplies).               
Patient:             I'm from over at Tarkinton.
Lab:                  Oh.  There's a bunch of John Browns down there, isn't there?.
Patient:             Yessir.
Lab:                  How many of them are there down there?
Patient:             Well, my mother and father had 13 children.
Lab (smiling):   How many of them were named John Brown?
Patient:              Not too many of 'em.