Comment by pessimizer

Mantrapping is a fairly good analogy, and that's very illegal. If the person reading your gas meter gets caught in your mantrap, you're going to prison. You're probably going to prison if somebody burglarizing you gets caught in your mantrap.

https://en.wikipedia.org/wiki/Mantrap_(snare)

Of course their computers will live, but if you accidentally take down your own ISP or maybe some third-party service that you use for something, I'd think they would sue you.