Recently the Tokyo Metro has been putting out a series of ads to teach Japanese people good manners when riding the train. Some people have the the worst manners. It’s almost unbelievable. You know it has gotten bad when they have to do an ad for this situation.
Yes, I have actually seen this many times. Usually when I take the train late at night. I often see drunken men taking off their shoes (because putting your shoes on the seat is rude, right?), and laying down on the seat. Of course they fall asleep and snore very loudly. It was surprising the first time.