So, when I was in LA, I was treated to the Phil Spector trail shenanigans. Since Phil is only a minor celebrity now a days, you might have missed some of this.
Well, the defense doctor was on the stand. Mind you the doctor (a he) is married to Phil’s lawyer (a she) and the wife is examining him. There are discussing the actress’ death, and how long she lived (a question being how did Phil get blood on his shirt if she shot herself and he wasn’t close when the bullet was shot).
Suddenly (aha!) the doctor gets an idea out of the blue. “Maybe,” he postulates, “she lived a few moments after the bullet ripped apart her spinal column. Then as she breathed out to a consoling Phil Spector, she exhaled blood.”
Since he “just thought of this” the defense did not provide this theory to the prosecutor earlier (as say, required by law). The judge and the prosecutor threw a fit, but it got out for the jury to hear it.