The RAF use Graphite bombs to cause severe disruption to electrical installations such as power stations. It has the advantage of low collateral damage, not needing high explosive, and not damaging equipment beyond what a jolly good clean will fix.. Just a ruddy nuisance for a while that's all. (and enough in most cases.)
You can also sabotage annoying radios in the workplace.. Not that I would ever do such a thing! A pencil line on the porcelain of a spark plug from base to terminal will also stop it working, much to the amusement of certain apprentices!
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