This is quite nice, i once saw a movie, i've forgotten d name, something similar to this was used, though it was used in a bad way, some type of gas was used in killing people, the gas worked in such a way that, when its inhaled by the victims, they'd feel like they are being attacked by something or someone, in one instance, a guy felt like he was being attacked by another guy with a knife and he died through the process with knife marks found on his body.

Apparently the brain thinks he was being attacked with a knife and created all those knife marks on the victims body which led to his eventual death...it was very strange to me.