A childhood belief about being watched

I watched a show on urban legends once, and one of the stories mentioned was about a hotel that equiped all of its bathrooms with "see-through" mirrors (the mirrors that are actually windows) and that people were watching on the other side. However, I thought an urban legend was defined as a real event at the time, so whenever I stayed in a hotel, I avoided going to the bathroom and was sly when taking a shower because I was afraid people could see me through the mirror.