Even "straight forward" procedures can go wrong.
Most CABGs and VRs are textbook procedures, with the speed bumps occurring during convalescence, but I can't imagine being on the OR table and hearing, "Oh, crap (or worse )! She's bleeding! Quick, put her under!"
I'll take happy juice for the procedure.
I've had some general surgeries and my surgeon has this way of saying things without actually saying anything intelligible during a procedure, if that makes any sense. He just kind of mumbles as if to not let me know what he's doing while directing the nurse. He'd usually hide the instruments from my line of sight too. I have to believe they're going to avoid saying oh crap