Before I opened it, it amused me, because -- well -- since I'm not a US citizen, it would be illegal for me to serve on a jury, and it seems like it could be amusing to inform them of that fact. The fact that they got my name wrong (they swapped my last name and my second middle name) was really dumb too, but I didn't care too much because, well, I don't have to serve so whatever!
... but then I opened it and read it, and I have to send them frickin' proof (photocopy of passport or alien resident card) that I'm not a US citizen. I have to waste my time and money to correct their imbecilic mistake? *sigh*