I would practically lose my mind if I was able to use the Rift+Hydra and play as Spiderman webslinging through New York City...
Imagine seeing through the eyes of Spiderman with the Rift and using the Hydra to point and shoot exactly where you want the webs to attach to. You would be dashing at extreme speeds high up above the streets with full control...
Spiderman is obviously copyrighted but what if we made a demo of swinging on a rope high up in the air or jumping across the top of buildings? The closest game I can think of to that would be Mirrors Edge, but it has too many cut scenes and forced perspectives.