Easy just tell them your a racist and you think everyone should fry. You will be dismissed no problem.
That might get you out of actually serving, but you still have to show up the first day, which is the real pain in the ass because they never pick you anyway. I'd guess they don't select one in ten.
I like the idea of blowing it off, and claiming to never have received the notice because it wasn't sent registered or certified mail. It's very believable where I live, as the mailpersons here don't give a shit and put the mail in the wrong boxes regularly. I'd get a PO box, but it's still the same USPS dummies boxing the mail, just a clerk instead of a carrier.
I think you could avoid jury duty if you moved constantly.