How will we fear augmented reality? This conference description offers one uncanny suggestion:
There were also times when it felt like I was chasing ghosts; These were the times I would go to a spot because a friend had checked into that spot only to discover they were no longer there.
This AR ghost sense depends on being already connected to someone else, or at least being aware of them. It's the flip side of stalking, being shaken by your target's misbehavior.
Perhaps AR ghosts will become associated with glitches, such as rendering delays or databases slow to update. Like uncanny Second Life rezzing/
We've already seen a version of AR hauntings with Ghostwire. Ghostwire is safer, more mannered, in that the ghosts aren't socially connected to the user (presumably).
We've covered other likely forms of AR fear previously, like porting the classic fear of violent computer games onto homes.