A childhood belief about classes

In elementary school, there was a bathroom on the edge of the school grounds, which was seldom monitored by school officials. A rumor went around that there were these older kids (7th or 8th graders maybe, or high-schoolers) who would hang out in the bathroom with electric razors. When an unlucky child wandered in there, they would be grabbed by the "Shavers," who would proceed to shave off all your hair! We would tell each other "don't go in there, the Shavers will get you!" I wonder now if it started as a warning to some kid not to wander alone into unmonitored closed spaces. At that age most of us had no knowledge of sexual predation.