In the final year of primary school, our teacher told us about how, while growing up in the countryside, she and her friends used to form a human chain. One person would then touch an electric fence, and it would give the person on the end of the chain a shock.

Imagine our delight at finding that the monitor on the library computer, an Acorn Archimides, would spark if you came too close to it. Every lunch time we would make chains and pass the current along, sending sparks around the room at the metal table frames. That is, until we found some cartoon porn on the computer, and it got taken away.