I saw two very funny things in an audio store in about 1980 in Cambridge, MA where my brother worked. The NAD 3020 Integrated amp was the new “hot” thing in very affordable & good sounding amp but had limited power & quality/ reliability issues. While listening to a demo & the salesperson’s hype on how good it was, it literally burst into flames filling the room w/ a horrible smelling smoke.
Then another time I heard a salesperson explains to a customer when it was taking so long to set up his new to the market NAD turntable because the tech doing it was very meticulous & it would be perfect & sound amazing ! I then walked into another room where I could see someone bent over the turntable saying “ what a piece of crap!”. It turns out the geometry of the included arm was wrong & a cartridge couldn’t be properly aligned ever. So funny! He became a good friend & went to design & build high end cables first for Audioquest & then his own company.