Just watched Upstream Color (2013) written, directed and produced by Shane Carruth. It's the most shockingly disturbing science-fiction movie I've watched in a long time! Although not similar to Contagion, something on the same lines about a deadly virus that passes from humans to pigs to orchids.
A thief injects a drug into various people and robs them off their whole money. The victims remember nothing and are left to lead almost wretched lives with no money and an unhealthy body where the parasite keeps growing inside the victims.
Among the lot, two people are attracted to each other and they begin to stay together to support each other. Unknowingly they stumble upon some lines from the novel Walden by Henry David Thoreau and as they pursue it, they finally catch the culprit.
Although the movie is only 96 minutes long, it's so chillingly slow that it becomes painful and disturbing to watch it. As the plot keeps unfolding, you begin to get disturbed more and more, yet you just don't want to switch off. You stay until the end to find out what is exactly happening on the screen and why is it happening.
It's a must watch but you got to be very patient and stay till the end to actually enjoy it.
P.S : I thought of giving it up so many times and switching it off mid-way, but I sat through it. And I don't regret it a bit.