This video starts off tame enough. It's just an average imaginary virtual reality with Hatsune Miku backed by fake (but pretty impressive) interactions thanks to the Oculus Rift and the Razer Hydra motion controller. Then, around the 3:30 mark, an oversized Nendroid Miku appears and all hell breaks loose.
Nao_u's demo is the single most terrifying thing I've seen so far using an Oculus Rift, so thanks but no thanks! I'd rather chop my head off!