Martin Sheen

'Apocalypse Now' is often touted as one of Martin Sheen's best movies in his career, but the production of the flick proved to be a total nightmare for the actor.

The film star – who was drinking heavily and using drugs frequently during the making of the flick – suffered a heart attack in the middle of the jungle, and was forced to crawl for roughly half a mile before he was found.

Given his condition, Martin was even administered his last rites.

Thankfully, the actor made a full recovery, though the situation delayed the movie's production by six weeks.