 SDP is not a name of a ban from the 90s, nor is it a disease. It is a discriminative stimulus for punishment. So I guess it is not even going to get into the how the fact that you could have all sorts of venereal diseases and have SDPs associate to put them, but venereal disease, who says that anymore? Anyway, so an SDP is a discriminative stimulus that signals that if you engage in a particular behavior, boom, you're about to get punished. You don't... Why? I don't know why I said it that way. It's a really useful tool at the end of my hand and the camera and noise. Anyway, so positive is that, so a discriminative stimulus for punishment. If I'm always yelling at the kids or if I'm always getting up into kids' grill or something, the sight of me might become a discriminative stimulus for punishment. So what will happen was they'll avoid me altogether, right? So they'll just avoid that whole punishing stimulus to himself, which is me, right? Which the kids don't do that, but they could, right? So anytime there's a signal that punishments about where you come, contingent on a particular behavior, that signal becomes an SDP. You'll notice this all the time. If all you do to try to control behavior is punish, people will just simply avoid you. You need to reinforce behavior, all right? So you become an S-D-E, just an S-D-E, not an S-D-E, just S-D-E. Sorry. So, B and S-D, not an S-D-P.