We used to do a lot of work for this one archiitect, who also would act as the owner's represenative.

He always gave me a bad time about "charging too much for our labor".

Finally he build his own house and he decides he can pre-wire the house himself...

I get a call from him, "Hey can you guys come out and finish the pre - wire? Now, I see why you guys charge what you so much ... This sh*t is hard!"

He never complained after that!