Scotty: You're trying to kill us all?
Spock: If I remember correctly, it only causes fatality only when used in pure form.
McCoy: That's right. And in this derivative mixed with alcohol, it merely deadens certain nerve inputs to the brain.
Scotty: Ah, well, any decent brand of Scotch will do that.
McCoy: Umm, well, one good slug of this, and you can hit a man with phaser stun and he'd never feel it or even know it.
Scotty: Does it make a good mix with Scotch?
McCoy: It should.
Scotty: (grabbing a bottle) I'll let you know.