Calling it my 'favorite' is kind of tough, but I always felt so affected by Alaska 261 (the MD83 that had the horizontal stab jackscrew strip itself off and completely free the horizontal stab). The sheer desperation of the pilots and the way by which the plane twisted and inverted is just heart wrenching. Having such a lack of control is just an awful thought. The whole maintenace crew in my first hangar always took the jackscrew greasing task card very seriously (not that others were completed otherwise) because a lot of them were alive and some even working during that disaster (that was very seriously maintenance caused).