Reminder or Threat?

An older gentleman was on the operating table awaiting surgery and he insisted that his son, a renowned surgeon, perform the operation.
As he was about to get the anesthesia, he asked to speak to his son.

"Yes, Dad, what is it?"

"Don't be nervous, son; do your best and just remember, if it doesn't go well, if something bad does happen to me, your mother is going to come and live with you and your wife...."