Our darkroom was reserved for the photographer for the school paper. There were about 3 of us and we had the "In use" light on a lot.
We never had any teachers that were into photography and it was passed down from "class" to "class" so to speak. The funny part is it was next door to the Principal's office. Sadly, I don't have many of those images left and I'm guessing a lot of the archives has gotten lost over the years. I need to get hold of my partner in crime and see if he has anything left. The existence of the dark room was unknown to most students except for a few young ladies.
The lines would go something like: "Do you want to go down and crank a knob in the dark?"
How juvenile . . . oh wait we were.
Its amazing how many times it worked.
Edit: The interesting thing is that we were doing medium format and no 135.