Turns out haptics has its own uncanny valley

An article in Science Robotics claims that virtual reality experiences can produce an "uncanny valley of haptics."

The "uncanny valley" phenomenon is normally reserved for robotics, where the closer a humanoid robot gets to realistically imitating a human, the more it creeps out real humans. 

One example is that if two separate handheld controllers provide haptic sensations in a specific way, the user experiences that feeling not in their hands, but in the space between their hands. This is a trick of the brain, which assumes the sensations have not two sources, but one source, and places that source between the hands.