Don't you just love Cracked?

About the famous scene where the monster pops out of the guys chest in Alien:

"What sells that scene isn't the creature effects, or the fact that if you were an audience in 1979, it was the absolute last freaking thing you expected to happen right then. No, it's the apesh.. reaction of the crew when the little bastard comes ripping out.

If you think the other actors' horrified and shocked reactions were convincing, it's probably because they, like their characters, had absolutely no idea what was about to occur."

"Her scream of disbelief and subsequent desperate, hysterical sobbing was all completely unrehearsed. She actually passed out before the scene was finished and they had to complete it the next day. Yaphet Kotto had to retire to his room and get his blood pressure down or he might have had a heart attack."

Read more: 5 Amazing Performances From Actors Who Weren't Acting | Cracked.com http://www.cracked.com/article_19693_5-amazing-performances-from-actors-who-werent-acting.html#ixzz1pCwuoxyX