On Christmas, Mark Nutt introduced his 88-year old grandmother to virtual reality. He slipped a Google Cardboard interface (an iPhone in a cardboard frame) over her head and turned it on.
She doesn't just enjoy the experience. Her mind is utterly blown! She screams with joy to the point that it's disturbing.
And that's just Google Cardboard. Just wait until she experiences a professionally-developed horror game in Oculus Rift!