Legal Question in Intellectual Property in Indiana

Plead the 5th (right not to incriminate yourself) or have an Illness, although for a long trial that better be a long illness.

On a more serious note, if you gave testimony in deposition, you are likely to be subpoenaed (or perhaps you already have) and that is a Court Ordered appearance, which can get you cited for contempt if you try to play games to get of out being a witness. Just go and testify, unless testifying might incriminate you, although I gather that is not an issue since you say you already gave deposition testimony. If you are not in any danger legally from testifying, why not just relax a little, chill out, imagine the attorneys are in their underwear or whatever makes it more fun and consider it an opportunity to learn about testifying and trial tactics. Also, I assume you get paid for this. Perhaps you can establish a reputation as an expert witness and make all that big expert witness fee money! If your neck is not on the line, why the worry?