h2; with todays USB computers, it.won’t help to switch the keyboard and mouse wires!
How about turning off the lights 100 times a day?
This was the best one. Whenever we turned off the lights, our teacher would go and turn it back on. Well, one day, a bunch of boys stood around the teachers desk “discussing” things with him. Then someone turned off the light. The teacher tried to get up and turn on the light, but there were too many boys talking to him. Meanwhile, two boys unscrewed the light switch, removed the wires from the switch and then put the switch back. Finally, the teacher got to.the light switch and could not.understand why the light was not going on!!!