Once I meet a girl who had had a bad break up with a guy, and you could tell that things where not going well. You could tell that the acceptable drugs of alcohol, and the comfort of her cats just weren't working any more. You could tell it in her eyes in that she wasn't really looking at you, you could tell it in that she was going to the bathroom every 10 min that she was on something stronger that was destroying her life. I could see that she was again making a poor choice. This works at me and I have to ask "When will it end".
In my line of work we call that a positive feedback loop where when something happens to activate the system and then the response to the system doesn't calm the system but further increases it until something burns out or blows up. They are rather undesirable. It's like a hole in a dam. The little bit of water takes a little dirt with it which lets a little more water out which takes a little more dirt and so on until the dam becomes useless and the water is gushing through.
The desired system is a negative feedback loop where the response to the initial impulse reduces it and eventually gets rid of the initial impulse all together. This is allot like driving in a car and then you hit a bump in the road. The bump makes the car bounce up and then go down and then up but not as far as before and slowly the bump disappears until there is no more evidence that the car even hit a bump before. This kind of feedback loop used extensively.
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