12. Shoes, on and off, on and off
Do get used to taking your shoes off when you enter a house or restaurant, particularly outside of Tokyo.
The floors in traditional Japanese houses were covered with tatami mats and with very little furniture.Most houses still are such is the tradition. These mats were used to sit on and to sleep on instead of chairs and beds. As the streets were muddy and dirty, they did not want to bring this dirt onto the mats and into the houses. So shoes were taken off outside and slippers were put on inside.