I tried mentoring a coach. He gave me his password so I could see his setup. It was unbelievable! He had his center, with a PER of 1, practicing 15 minutes on his jump shot. His team was winless and he complained in the coach's corner, "This game isn't fair. You'd think I'd win ONE game with just luck."
The entire thing was a big mess. I didn't fix it for him but gave him many suggestions. He didn't implement any of them and quit after that season. And he also failed to thank me for my work.