Would be scary if it caught those flashing moments of doing something extreme all of us experience and acted on it (ie, walking by a ledge and thinking of throwing your new laptop off it).
Whoa, that just gave me chills. When I used to work for fast food, every time I walked by the deep fryer with a bucket of ice I'd wonder about all the things that would happen if I just decided to dump in the ice.
First the cube sinks, so you won't be able to get it back easily if you want to abort. It rattles around the bottom of the fryer as it melts and then converts to steam. The bubbles of steam rise and splatter violently.
(I got in a bit of trouble that night, as the patrons could hear the commotion in the dining room.)