The key to the binocular case on the bridge of the Titanic was scheduled to be auctioned on Saturday:

It belonged to second officer David Blair, transferred from the ship just before its maiden voyage. But he forgot to hand it to his replacement.

As a result officers had no access to binoculars on the bridge or in the crow’s nest – and 1,517 people perished when the ship hit an iceberg on April 15, 1912.

Link via Digg | Photo: The Express

UPDATE 4/22/10: After receiving a virus complaint, I've changed the link.