[shiroiuma]

As an example, think about how some alien visitors might try to piece together how we live day-to-day by watching TV shows and movies and reading whatever books they manage to dig up. The only way they'll even know we have bathrooms and take a crap there is if they find books or other archives detailing toilet diagrams, bathroom design, etc. If they just watch movies and TV, they'll think we somehow never have to expel waste, even though we obviously eat a lot as proven by how much screen time eating gets.