I remember a job a few years ago, I was installing an intruder system, and i had to run a cable behind a big, antique looking wall unit on feet, I mentioned this to the lady of the house who brought to our attention that one leg was just propped, as it had come adrift during a move previously, anyway we carefully did our work and repositioned the unit, in place, complete with wonky foot.
Fast forward 6 hours, the lady had gone out, leaving us alone to work.
The husband arrives home, touches base with us, and left us to carry on.
An hour later he collars us whilst we were working in a cupboard 'What have you done to my unit, the leg is broken, it's worth £2000, you guys had better have good insurance'.
I allowed him to rant further for a few minutes about how we should take more care etc etc, and how he would leave us bad reviews on our performance, then I casually mentioned the conversation we'd had with his wife some hours earlier.
I suspect he wished the ground would open up beneath him, as he grovelled and tried to get out of the hole he had dug.
The job got finished ok, but blimey was he sheepish whilst we were there.
Don't ya just love customers sometimes eh?