Here is one for the ages- after 20 years of hearing judges ask jury pools, "do any of you know anything about the events in this case" comes the story of Juror #8, as reported in Albany Times Union. She made it through voir dire, but while a prosecution witness was testifying, she recognized the defendant. She not only recognized him, but recalled watching him drag the victim across a bridge as the crime was in progress.
The fact that there was any discussion among the lawyers and the court about NOT declaring a mistrial is amazing, by itself.
So, Juror #8 will soon be "prosecution witness #1."