But they didn't realize it at the time.
Therefore, they continued to watch Cantonese soap operas.
Other door-effects appear when, suddenly, the door is opened. In this case, and only in this case (unless you are Bruce Willis), you can walk from one side of the door to the other (praise the lord for that gift!). But be careful, some doors lead to a totally different space, where the rules and behavior of the occupants might be completely insane, and is called "outside".