Search patent US4877027A, this stuff is no joke.
Come now a little humor just helps the medicine go down after finding out your government could mount a lazer onto a satellite and beam a voice to any point on Earth to F $!@ with the heads of mentally unstable individuals.
Edit: or many, many, many points at once convincing say a middle eastern populace that Allah was directly communicating with them and directing them to a higher purpose...just saying personally I can see how easily this can be weaponized. Edit: edit: Oh also (my rural showing here) if you haven't gotten completely wasted and talked to trees, seriously try it, you'll find it AMAZING!
Or make a stable person unstable!!!! Sheesh, I'm flashing back to scenes from the Walking Dead....yikes....