 In case you've forgotten, I've done a lot of videos and I haven't told you my name, Ryan. Anyway, so positive reinforcer is the stimulus that is added when you're engaging in positive reinforcement. So the stimulus that actually does the reinforcing, some people go, oh, well, there's only a couple of them. Oh no, there are lots and there can be all sorts of things. For the example, happens to be a positive reinforcer for me only in a context of the classroom or teaching because people pay attention to what I just did, that slap, right? And then they go, ah, I get it. And that is reinforcing for me when people get things, they understand it and it increases the probability of me doing that in the future. Even right now, talking into a camera, which is kind of odd, that seems to be increasing in probability. And I don't know if I'm going to be able to finish the video because I keep reinforcing myself, which is kind of funny. Well, I should stop laughing. Brad's back, they're reinforcing. So positive reinforcers, again, any stimulus, stimulus that when delivered in the process of positive reinforcement increases the probability of a response. Don't get the reinforcer and the reinforcement confused.