The Judge will always ask if anyone simply cannot serve. Then you get a chance to plead your case to the judge. SOmetimes what we think is a good reason for not serving they think is BS, and politely decline to dismiss you.

Everybody (me included) always thinks of going in there and, when asked, coming up with some smart remark about how everybody's guilty and whatever happened to a good old hanging and so on, hoping that neither side will want you. You get there though and find yourself among peers and people from all corners, and you realize some of them would make good friends, etc etc. You know, it becomes a social situation, so all those thoughts of smart-ash remarks go out the window. It could be done though....but you'd have to be good at it.