I'll go with electro-static discharge. I'm certainly more protected against static than most circuits
but you see what I meant, right? Tasing a circuit may well trash it, but it's not going to be much help inside an insulative case. Need a powerful electrical field to induce a current in the circuit for that, i.e. an EMP generator. Not going to happen using a taser
not sure of the calculations involved, been a while since I did physics involving induction due to electromagnets (and I did it at a basic level even then) but I'm thinking power is required, not just voltage.