H._R._Giger has created some very disturbing images and creatures over the decades.
http://www.theguardian.com/film/2014/may/14/hr-giger-film-artist-alien-i-am-afraid-of-my-visions
His monsters don't just scare the shit out of you.
http://www.swissinfo.ch/eng/culture/Alien_creator_H.R._Giger_is_dead.html?cid=38569780
They will tear you a new or larger ass-hole, if they don't burst out of your intestines or stomach first.
http://www.theverge.com/2014/5/13/5712734/alien-artist-h-r-giger-dead-at-74
HRG was the quintessential monster artist.
http://www.independent.co.uk/news/people/h-r-giger-dead-alien-artist-and-designer-died-aged-74-9361364.html
The-shit-snake wants to get into the intestines to feed & nest.
http://en.wikipedia.org/wiki/Alien_(franchise)#Prometheus
The next movie in the series will likely feature more gruesome scenes that are expected in science fiction monster movies.
http://en.wikipedia.org/wiki/Prometheus_(2012_film)#Sequel
Hollywood has spent a lot of money in producing monstrous sci-fi entertainment & excrement, causing some people to vomit or shit them selves from watching all the horror & excitement.
HRG was clearly fascinated by the light vs. darkness theme. Although some find his artwork to be too dark & disturbing, he was merely interpreting & depicting various manifestations of DARKNESS.