Do you have any one of a kind finds?

Do you have any one of a kind finds? Earlier today I helped out with a community yard sale and just about every electronic being sold was not rare, no longer relevant and not useful.

Of course, I wouldn't know this drive had I seen one.
http://sploid.gizmodo.com/impossibly-rare-nintendo-64-disk-drive-discovered-by-ve-1783737548