I've had this idea for a while now, of a girl strapped down and made completely immobile. Wearing a divemask/ gasmask w/regulator attached to an air cylinder and then left alone to watch the gauge on the tank empty. In my mind whoever set up the situation would have had to leave saying they'd be back in X amount of time, and the tank had Y amount of air in it where Y>X, but then they don't come back when they said they would. In reality though, the person in control would have just gone to an adjacent room and would be monitoring for when the tank goes empty, and would wait just long enough to come back to let the girl in the mask panic for a minute or so from not being able to breath after the tank runs out. The only problem with the set up (I mean besides something going wrong and the girl in it being without air too long and dying I guess) is that you can't pull the same trick twice on the same girl.... or if you can pull the exact same stunt more than once, that girl is dumb as a rock.
But yeah, anyways, finally got the idea together enough to get it sketched out thanks to chatting with a friend about it who had suggested the addition of the vibes.
Laters
-Rab