Yes, human interaction and communication must inevitably lead to some mistakes. It happens to all of us.
Last month a customer wanted a small document float mounted with a double mat. I suggested floating on a recessed background and elevating the main mat to also serve as a spacer from the glass. I suggested 1/2" exposure of the recessed background color, so it could be seen, recessed in the shadow, and she said "let's have just 1/8"".
Knowing that narrow exposure would waste the recessed background color and sensing that she misunderstood what I explained, or that she didn't know what 1/8" looks like, I held up my hand with fingers spaced about 1/8" apart and said, "That's about this much. Are you sure that's what you want?" With that, she snapped up her stuff and headed for the door, saying "I'll just leave, you're making me feel stupid".
I was gobsmacked. :shocked: