I heard this from someone...
A bunch of seniors bought a master key for the locks (which were not combination locks) and broke into the school one night. They took off all of the freshmen, sophomores, and juniors' locks off their lockers, put them all into a few garbage cans, mixed them up and put them back on one at a time. The next day, all hell broke loose when no one could open their lockers besides the seniors. I thought it was was pretty unique....