When you go in, if they even actually try to impanel you, they'll sit you in a room with a mess of other people and ask you a whole bunch of questions to determine your fitness for the jury. Even if you feel everything else about the case is fine (the one I was called for was a sexual harassment case -- not a chance!), they always ask something like "is there any other reason you feel you couldn't be a fair and impartial juror?" and you could always raise your hand at that point. Raising your hand just means you'll get to explain to the judge and lawyers how you think it might be difficult for you to be a good juror.

So that's what I'd do :)