He does not necessarily have to be insane...
In ZRH people tried to blind you with extremely strong lights, as part of their protest against new approach routes. Experienced once, but it's not at all dangerous, more ridiculous.
One incident is reported, where someone shot small light munition in direction of a small aircraft, about two years ago. While repeating the scenic flight with journos, an airprox happened with a bigger plane on the ILS :-)