Thread: What horror movie is this? Can't think of the name...

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I am trying to remember the name of a horror movie I watched on Halloween a year or two ago... It's a recent movie from the last 3-4 years or so I think...

Does anyone know the name of this movie?

It starts with a group of kids going to school with some sort of diorama project in shoeboxes. One of the boys has a dissected rat tied in his shoebox.
Later in the movie an older girl is babysitting/house-sitting and she goes to bed in a room full of creepy clown dolls, including a full-sized one which turns out to be a guy dressed as a clown, who attacks her. Later a girl (possibly the same one? I don't remember) is held prisoner by a serial killer (the kid with the rat from earlier in the movie) with one of her friends who she thinks is dissected the same way the rat was, but it turns out to be an illusion.

I'm pretty sure it's called Amusement.