My first trip to Europe was with my parents when I was in 7th grade. As I would be missing one full month of the school year I was asked to present some sort of social studies "project" when I returned to class.
I collected toilet paper from virtually every toilet (or lack thereof) I came across. The quality ran from burlap colored crepe paper to sheer waxed paper, to the infamous local newpaper to a cornhusk. I think I got an A for my collection which I had labeled with dates and locales.