Eden Lake - 8.5/10
I haven't had such a bad time watching a horror movie since... [REC] probably. Do yourself a favor and watch it. I don't want to tell you anything about the plot, because I didn't know anything about it and maybe that's why I ended up liking it that much.
If you want to watch an obscure Spanish horror movie in which you will also have a very bad time (and quite similar to "Funny Games"), watch "Kidnapped" ("Secuestrados").
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Dr Football > Dr Soccer