It’s common in the U.S., especially in apartments, to have rooms with no light fixtures. Instead, there will be one outlet that is wired to a switch by the door. That outlet is sometimes upside down to distinguish it from the other outlets. That gives you the option to connect a lamp to the switch to get the same result as having a light fixture. I would generally prefer that every room has a light fixture on the ceiling, but this is marginally better than having to walk across a dark room to turn on a lamp.
I used to work for a cable company. I remember a coworker telling me a long time ago that one of the challenges they used to have was making sure the caller’s TV was tuned to the correct channel. So, the conversation would go like this:
“Please change the channel to 27” (or any other random number that isn’t a locally used channel) “What do you see?” “Nothing…” “Good, change it to 3, now what do you see?” “Nothing…” “Good, change to channel 4” “It works!”
For those that don’t know, there was a long period of time where the auxiliary input into TVs was tuned to either channel 3 or channel 4. There was a good chance that the customer didn’t know which one was correct for their TV and would have assumed that it was already set correctly if you asked.