Last time I took my car into the dealership for service, their diagnostics said I might be losing oil by little bits. Young woman at the service counter said they could sell me a quart to carry around in case the dashboard signaled low. I said I would have to be sure a service station had the punch-and-funnel thing if the signal came on. She looked puzzled. I slapped my forehead and said "duh, now I remember, motor oil comes in plastic containers tapered at the end so you can pour it direct into the right place." I added that I was probably dating myself, thinking of days when you had to open a quart of oil with a thing like a church key.
"What's a church key?" she asked, looking just as puzzled.