If you get the wrong judge (they have heard it all) he can really ruin your day. The best thing to do is not to be there in the 1st place.
Another time, when I was still in college, I got called to jury duty. I was selected to sit on the jury and during the interview process, when I said that I was a student, the judge interjected and asked if it would be an issue for me since it was the second week of the semester and the trial was expected to last 4 weeks. I replied that I could get excused from my classes, but the semester is only 14 weeks long, so I would miss a huge chunk of the semester, so the judge excused me.