Bring a pen and a book.
First time I got called, the defendant did not show so they dismissed us all. Turns out he was in jail for another incident that previous weekend.
Second time I was called, I made it all the way to the judge questioning each of us. I was scheduled to give a training session in Rochester that week, so he dismissed me before either lawyer could object. Interesting thing with that case was it was a drug sale/possession case. Listening to the prosecutor opening statement, it sounded like he was trying to defend the perp.