I will come from the sales staff side.
I use to work in an auto pro on weekends. I had a guy come in for a set of points for what i cat remember. So he handed me the points & told me what they where out of. I looked them up & went & got them off the shelf & checked them against the old ones. I noticed the old ones had a big hole through the contacts so i advised him that he should buy a condencor so his points would last longer. He then said to me. Do you no what a condencr does? I said yes. He said Well you obviously dont! He then started crapin on about attoms & molycules (if thats how you spell it) & when they react & what the condencor does when this happens & kept going in for about 15mins about it. He didnt buy the condencor. Then the week later i was working & he brought the points i sold him threw them at me . He said that they where faulty & he wasnt happy. I said you have a condencor problem. So he craped on for another 10 mins about how a condencor worked. Well this time he walked out yelling & screaming cos I wouldnt replace his 5 dollar points under waranty. About 2 hours later he was back ordering a set of points & condencor looking very embarreced.
I found out later he was some science expert that had gone crazy & was in & out of mental hospitals.