I think at times it is because you're supposed to make mistakes, you understand? You'll get it better the next time. But you're supposed to ... you can be too perfect I think. And then it takes the swing away, you know, if you're too perfect. But if ... you see like you might come to work tonight and you feel like you're tearing the house down, and you really aren't getting off the ground as far as the people are concerned. And you come the next night and you feel like you're not doing anything and people come and says "you knocked me out, boy you really cooked tonight. " You know that's the way it is, that's just the way it is, it's an art. And you just can't do it all, you know it goes and comes.  That's about the best way I can put it, I just ... one night you're on, one night you're off.  That's the best, I mean that goes with the best, you know? But there are some guys that I've played with, I don't think ever had a bad night.