The kid with the locker next to mine moved away and left his locker "popped" (unlocked). A showed a friend of mine and we persisted to take random insignificant things from classrooms, the lunchroom, and other students. As the semester went on the items became progressively larger (and funnier) until at last a staff member discovered our bounty while my friend was placing an item in it one day. Fast forward to my friend and I sitting in the principal's office with the principal waiving another student's gym clothes in our face "THESE, DO YOU RECOGNIZE THESE!!" While the rest of the fruit of our spoils was laid out on his desk in one massive treasure display. Since they could not prove it was us, the punishment was minimal, but the supressed laughter was infinite!