One Apple co-founder took ridiculous fake-bombs-in-school threats to the next level back in the day.

When young evil genius Steve Wozniak was in high school, he purposefully built and programmed a fake bomb which ended up scaring the crap out of his school principal. His stunt resulted in a night in juvenile jail where, yet again, he stuck it to the man and taught his fellow prison mates how to electrify the bars of their cells. What a rebel.

The following excerpt comes from Walter Isaacson’s Steve Jobs biography of the same name:

“In twelfth grade [Wozniak] built an electronic metronome—one of those tick-tick-tick devices that keep time in music class—and realized it sounded like a bomb. So he took the labels off some big batteries, taped them together, and put it in a school locker; he rigged it to start ticking faster when the locker opened. Later that day he got called to the principal’s office. He thought it was because he had won, yet again, the school’s top math prize. Instead he was confronted by the police. The principal had been summoned when the device was found, bravely ran onto the football field clutching it to his chest, and pulled the wires off. Woz tried and failed to suppress his laughter. He actually got sent to the juvenile detention center, where he spent the night. It was a memorable experience. He taught the other prisoners how to disconnect the wires leading to the ceiling fans and connect them to the bars so people got shocked when touching them.”