Principal Farley’s brainwave-altering device is a gadget that emits purple light that alters brainwaves (and possibly muscles) to make those affected stronger, smarter, and more aggressive. It is used by Principal Farley on his students as well as himself later on.
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Principal Farley after using the machine on himself.
The device after having two wires switched.
Students being blasted by Tony with the device after it was altered.