"I can watch anybody all day long if they're really doing what they're doing. I have a fascination with human behavior, watching people talk, when they pick at their face or how they hold their hand or if they're listening to you, if they're not listening to you."

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You start doing the addictive behavior to feel good and then your receptors get overloaded with dopamine, then you stop doing the addictive thing and some of the receptors have shut down and you don't have enough dopamine to feel good. So then you feel bad and go back to the addictive behavior to get more dopamine. The strange thing is that it works with what we think of as uppers and downers and whatever you call gambling - sidewaysers.

— Bill Nye