Knock Knock is worth seeing. After reading some bad comments here, I went to see this movie with low expectations. And I left the theatre extremely surprised. I guess the bad reviews came from people not very open to a different type of thriller. One of the comments here complained about Keanu Reeves' beard! LOL. Anyway, Keanu Reeves does an excellent job with a beautiful acting the entire movie. The plot is unlikely to happen in real life, even though it is technically possible. The movie is very successful on giving a modern look to a still innovative type of thriller movie. In fact, this is a copy of an Austrian movie from 1997, and remake in 2007, called Funny Games, directed by Michael Haneke.
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