Close your eyes when Anne (the wife) talks on her mobile at a party. It immediately cuts to a chicken being killed and it's horrible. You don't get any warning so be careful. You'll hear flapping so keep your eyes closed.
There is a very, very abrupt and unexpected act of violence at 1:28:39. It's not a traditional jumpscare but it had the same effect on me.
If you don't feel like keeping watch of the time, it's right after these pieces of dialogue: "Sit down." "No, I won't. What do you want?" "I truly had no idea about [spoiler]." "Is that all?"
There are two very bloody scenes, one involves a rooster - it's best to look away when you see Anne talk on her cell phone as the scene plays shortly after. The scene is a little long. Another scene involves a sui**de, it is graphic and is replayed a few times in the movie.