When I came for the first time to teach English in China, I crossed the border on a bus from Vietnam. My journey took around 8 hours and I met two people there, a French guy and a Chinese girl. Once we got off in Nanning, we realized that there were no tickets available for any trains that night, we had to wait till the morning to carry on to our destinations.
We decided to share the cost of this night's accommodation and reserved a hotel room with two beds. Nothing would have been strange about the experience if we knew that it is very common in China for the hotel rooms to have glass walls in the bathroom.
Now, three strangers of different genders had to share a room with transparent walls in the restroom. After the first shock, we just decided to in turns leave one person in the room to shower.
Well, that was the first experience I had with China, and I learned way more strange customs over the years. I highly recommend you visit China too and discover something mind-blowing yourself!