Total Recall.
I've been thinking that this type of thing would be possible for a while. I didn't actually predict the "modification of memory" part. But, with advances in modern pharmaceuticals and virtual reality, I thought that the possibility of immersing someone in a VR chamber for a week while making them "think" they were in Aruba on the beach, or on Mars as a secret agent, would be possible.
The implications of this are astounding. Can you modify someone's memory to remove memories of an abusive parent? Perhaps that would severely cut down on rapists and serial killers.