 Please the definition ring though? Yup. Signal that reinforcement's not available. Yes. You're recording. There it is. Now just clap in reverse and just fucking do the whole thing over. All right, we're here with a stimulus delta. The idea is that reinforcement is no longer available for said behavior. So you can be at a club going, pow, pow, pow, pow. It's a signal. Pardon? It's a signal. It's a signal that reinforcement's not available. So the idea is that you're at a club and everyone's dancing in group and because the music's fun to dance to and all of a sudden the music stops and people just kind of go, that's awkward. No, I'm just dancing randomly. I'm going to stop because there's really no music there. So that's weird. I'm going to stop now. Estalda. Estalda. Sweet.