With water long, a bunker skull is instant death.
Rory McIlroy made the hacker mistake of skulling a sand shot at the 2013 WGC-Match Play. In the first round against Shane Lowry, McIlroy was 1 down when he hit into desert scrub near the 15th green. Forced to play his next shot lefty, he hit it into a bunker. McIlroy boned the sand shot 20 metres over the green, and walked right to the next tee, conceding the hole. He lost the match 1 down.