Great thread!
I have a couple.
At pretty much every show we go to we will have at least one person who says "I have really small hands so I need a thicker shaft", as well as another person who says" I have really small hands so I need a thinner shaft". The same goes for "I have really big hands" as well.
The other one is more of a story. Several years ago I got a phone call from someone who had the chance to try out one of our cue shafts. He had played with a friends and fell in love with it, and called to order one for himself. He proceeded to say that he wanted it to be 13.1mm, have a 16" pro taper, and come with an ivory ferrule. I quickly told him that I could not build him the shaft he wanted. He was quiet for a moment and then asked why not. I replied with this question, "when you played with the cue shaft we made, did you like the way it hit, and the way is played? Did you like the low cue ball squirt and how easy it was to pocket a ball with side spin?". He said that he did, of course and that is why he wanted me to make him a shaft. When I told him that if I made the shaft the way he wanted it, that it wouldn't play like the shaft he tried, he was completely dumbfounded. He just couldn't understand why.
Even with all this, we are really lucky to have customers with such passion for pool. I know they can be tough, but you just gotta love em!
Royce