was a bit of an a hole...
when I ws a kid. Sent to a no cool (resi) for my first call. Find no 24v to contactor, trace it back to stat. As I'm removing the cover, H/O proudly states that it's only a year old & he did it himself. Tell him I'm very proud of him, then show him the broken wire jutting out from the "Y" terminal. Strip and re-attach the wire, do the cursory check and write up the invoice. When he sees the amount, he starts yelling "You're charging me $XX dollars to turn a screw???".
I replied, "Only charged $1 to turn the screw, charging you $XX-1 for knowing which screw to turn". He calls my boss screaming. My boss gets on the phone with me and, while trying not to laugh, tells me to lower the price by $X and get out of there.
Totally different attitude now. Aging 20 years does that to a guy.