My story has to do with a demo session in Nashville some 20+ years ago. The guitarist was (and amazingly still is) a good friend of mine, and we were cutting a demo of several of his instrumentals at PolyFox, if memory serves. It was a song he and I had played together for a while in a band before he got his Nashville gig which gave me the opportunity to show my arse. Anyway, We all got together beforehand to make sure we knew where things went, etcetera. There was a short bass solo (16 bars) at the end of the bridge, which I had crafted over time and had down pat. When we rolled tape, I discovered that among the things I hadn't paid attention to was the 12-bar bass solo... Oops.. I had to edit the line and relearn it really quick (but it worked out) since he was paying a half-dozen musicians and a couple of engineers union scale. I don't think I've ever felt so incredibly stupid and careless as when I cost a great friend so much money because I was too careless and arrogant to pay attention during rehearsal. Now, I write these things down and keep the papers where I can get to them quickly... I'm still embarrassed that he might remember it...