The Gimli Glider

The aptly named DamnInteresting.com (a personal favorite) has an article about The Gimli Glider, an Air Canada 767 that lost engine power in mid-air:

After repeated unsuccessful attempts to restart the stalled engines, Pearson and Quintal once again consulted the 767 emergency manual, this time for advice on an unpowered landing. Much to their dismay, no such section existed, presumably because a simultaneous engine failure had been too ridiculous for Boeing engineers to contemplate.