Clients are like cicadas.  You can't get them to move for 16 years because their internal clock tells them they have 17 years to act.  

One of the last returns I did was for someone whose mother was in the hospital for the last couple weeks with a terminal illness.  We finished the return Monday, she died Wednesday.  Now I'm looking for a sympathy card.  "Sorry for your loss.  You had all the numbers and paperwork by February."