Mike Tarantino and Karen Sandler made and sent a paper record and player, with a song they'd recorded.
http://idle.slashdot.org/story/11/04/15/133206/Couple-Sends-Record-Player-Wedding-Invitations

BIND's max-ncache-ttl setting defaults to 3 hours for a good reason. Negative caching TTLs are capped to avoid everlasting NXDOMAIN records sitting in recursive caches.