 This is my friend Dopey. I mean Dopey Mean. I mean Dope-a-mean. Whoa, you thought serotonin was important? Listen to this guy. Reward and pleasure. Dopamine is involved in addiction. You get addicted to things that make you feel like your dopamine levels increased. And this is an interesting. Dopamine is also involved in motor function, and low amounts of dopamine are seen in somebody with Parkinson's disease. So Parkinson's is a condition where you have physical tremors. Your brain is fine, but you don't have control over your body anymore. And that's associated with low dopamine levels. Dopamine is involved in motor action, but it seriously plays a serious role in motivation and reward, like happy, feeling good. So man, this stuff, like, it really makes you think about what do drugs do? Like how easy is it to throw chemical into the mix that might act like one of these really important neurotransmitters? And we throw the whole thing into wackadoosiness. So let's look at drugs. Let's look at some examples of how drugs can act.