There’s a reason why the instructions on the Xbox Kinect, which allows you to play video games by sensing your gestures, tell you to clear the playing area and make sure you have plenty of elbow room, especially when you are playing with two people. The reason is this video.

You know exactly what’s going to happen. The only question is when.

Want more consumer news? Visit our parent organization, Consumer Reports, for the latest on scams, recalls, and other consumer issues.