If two hot people show up to your door in the middle of the night, you'd better reconsider having a threesome with them. That's the message of Keanu Reeves's new horror flick, Knock Knock, only things go even worst than you may imagine. He plays a happily married man who is coerced into a sex fest by two young women in wet clothing. Because this movie is written and directed by Eli Roth and is not a full-on porno, things get really gnarly when they hold him hostage for being a "bad boy." This still sounds like a porno, doesn't it? Well, it's not (or is it?) and things take a really messed-up turn. Watch the trailer, but not at work. The movie is out on demand and in select theaters on Oct. 9.