Facebook reminded me of a memory of 4th grade. My teacher, Mr Scott, had a crank from an old school telephone that would generate electricity. He used to have the whole class hold hands in a circle, and have kids hold onto the generator and then he’d shock us all. One time he decided to get bowls of water and put the wires into that and then have us put our fingers into the water… YOWCH!
Can you imagine a teacher doing that in this day and age… it was kind of sketchy at the time.