So I've decided that glitter is the new anthrax, and that anything covered with glitter that's deposited in my mailbox with an innocuous-looking envelope needs a haz-mat suit. Seriously. Glitter never goes away and seems to stick to your skin like a tick. I wouldn't be surprised if glitter reproduced, as it always seems there's more accumulating than decreasing.
Word to the wise: if you get a glitter card in the mail, quickly run it out to your big, black trash can (don't put it in an inside trash can if you value the glitter-free status of your home). And remember, it's the thought that counts, so you appreciate the friend or family member who sent the card. They didn't really know that they were sending legal anthrax.