In all honesty, that was the last volley in bathroom pranks.
My humble contribution was the Bra-cicle. I would find sneak into their room and grab their bra, get it wet with water, wrap them around some popsicle sticks, then put them in their freezer.
Eventually, one would ask what happened to their bras; and I’d ask them if they checked their freezer compartment.
Naturally, my undies got the same treatment later on.
I can only imagine that the gals liked you since you were fun loving! Personally, I would have laughed and laughed. When I was in high school, I did my own “psychology” experiment. I secretly started taking the erasers and hiding them. Within a week, the teachers were literally having verbal fights in the hallways over “their” missing erasers. I returned them and waited a week. Then I started hiding the chalk. I guess I was sort of bad!