This video may be old news, but I'd never seen it before. A military helicopter tries to land on a ship and, well, fails. Link to 2.6mb WMV file (Thanks, Michael-Anne Rauback!)
Along those same JG Ballardian lines, the House of Rapp has a gallery of links to other aircraft crash videos. Link
UPDATE: BB reader Nicholas Evancich found the sad story of the helicopter crash. From the Unofficial US Navy Site:
On Dec. 9, 1999, a CH-46 Sea Knight helicopter, with 18 people on board, crashed while attempting to land on the Navy tanker PECOS (T-AO 197) during a training exercise. The chopper's landing gear apparently snagged a metal safety net and the helicopter flipped over into the water and quickly sank. Eleven Marines were rescued by special warfare crewmen on two nearby boats. But six Marines and a sailor drowned, their bodies recovered later from the sunken wreckage by an unmanned submersible vehicle. Link