Chimp attack scene.. not scary at all. Instead it was sad (spoilers)
Not even unsettling. What are you guys taking about? this was just sad.
I felt sorry for the animal. Not what it did, that was awful but it did not know what it was doing. After it attacked one of the female costars (presumably dead) and she lay out on the floor it tried to tap her foot to get her to get up again. It just did not understand the full capacity of the action it just committed, maybe even forgot and perhaps thought she was 'sleeping'. When it attacked and killed the male co star you notice the man tried to wave his arms up at the chimp (perhaps intimidating it) and that seemed to trigger the animal again.
Then the chimp tried to remove it's birthday party hat as though it wanted out of the costume the humans had put it in. Maybe it had enough of being treated like a toy. By the time it reached the Asian boy under the table it appeared to calm down. It wanted to fist bump him and looked confused then it was shot to death.