 Alright, positive reinforcement. Again, this is the one that everybody thinks they know, but they don't really know. So positive reinforcement is the contingent addition, or my words started to come on as application, but it finished as addition, which was weird. So the contingent application or addition of a stimulus following a response, right, that increases the probability of the response in the future. Don't forget, you have to watch in the future. You have to see, does the behavior change? If the behavior doesn't change or maintain at the certain level, it is not reinforcement. So again, the positive or the added, a stimulus is added to maintain or increase the probability of a behavior. Want a chocolate? Please. So Brad's trying to reinforce me as he shook the camera because he was trying to turn it off and he realized, oh shit, we still have to finish the examples. So anyway, so Brad attempted to reinforce me with a piece of magical chocolate that doesn't really exist. But just the fact that it was humorous is reinforcing enough. And in fact, a great example of doing these videos, these are short little tight packed videos. And it gets hard to do these things. So Brad and I spent a lot of time just joking around behind the scenes. And that seems to be a positive reinforcer for us to continue to record these things.