In Grapes of Wrath the Joad kids when staying in a government camp flush a toilet without realizing what they are doing, and think they have broken it--they had never seen a flush toilet before.
Go back another 100 years and the lifestyle of the average person was much worse than that of an extremely poor person now.
A lot of the old folks around my hometown were depression era orphans. I used to listen to them talk about coming to town on the train and being “adopted” by local farmers right there on the spot.