The ability to state that 'your' car is the wrong colour - they don't sell. The wrong model - the GTS V8 GT hardtop was a much better option. Regular servicing and cleanliness never seems to pay off, all they ever do is consult the little guide and that is what its worth.
Are there any sincere salespersons out there? I doubt it otherwise they would be nurses or lollipop men.
When a lone woman arrives for a pre-booked test drive, don't look at her and as incredulously 'are you on your own, you haven't brought anyone with you????'
Then do not walk over to you colleague and request the keys for the car to be tested, who replies sotto voce ' don't let her look in the boot, it's full of all my camping equipment'.
I so wanted to be cross about this, as my husband was a car dealer and of course I was involved too, we sold many many over the years. Mostly by word of mouth or people asking for a specific model.
However, I have also met all the stereotypes mentioned above, from the sheepskin coat and dark glasses sort, to the shabby suited pseudo toff.
As a postscript, could write chapters on strange customers too, wheel kickers, corner bouncers etc etc