I've discovered that the "deer in the headlights" look is a great business tool. Someone just stopped by my office and I used it to great effect.
Bob: Hey Travis... do you know: to apply fine-grained permissions to a list item, do—
Travis: [silent, terrified look with eyes wide open]
Bob: Okay, that's a no. [leaves]
The whole conversation was over in ten seconds. Great success!