When I was younger and worked at a service station, we had a summer helper who knew absolutely nothing about cars.

After the first couple of weeks we convinced him that there were different blends of air in tires depending on the season, or what type of vehicle they had. We told him that people had to change between summer and winter air depending on the time of year. (Winter air, of course, was more dense and wouldn’t leak out as easily but also wouldn’t balance out properly in the summer.)

We also had two air hoses in the shop, one labeled “passenger car air” and the other labeled “truck air”, and he was always careful to use the correct one even though they came off the same tee on the wall.

Looking back on it, it was funny, but we were dicks...