Here are some things I wouldn't like my doctor to say before surgery:
"What is his/her blood type again?"
"Ok, we just have to reattach your whatcha-ma-call it back to your thing-a-ma-bob."
"Don't worry, we only lost 3 patients this week for this surgery."(Even if it is a joke, not helping!!)
"I had a rough night, so lets be quick."
"Please don't die, I'll get fired if I lose any more patients."