This just reminded me of a funny story about a North Korean refuge who had escaped to South Korea. She was trying to figure out how buses worked and would stare at people getting on the bus to figure out how they paid.

She said that she noticed everyone would just kind of bump there butt on a sensor when they got on. Not knowing that something like contactless payment existed, she assumed that it must have just been some weird cultural thing that she didn't fully understand.

So she worked up the courage to board a bus and just bumped her butt against the sensor. Obviously it didn't do anything and the bus driver must have thought she was crazy.

Edit: Found the video! https://youtube.com/shorts/L8DeAqXzOtk