Chapter 6, Episode 2: DMing Alignment Without Killing Your Game
Nothing kills a game faster than bad DMing, and alignment is ground whereupon a DM must needs tread carefully. As most DMs handle alignment terribly, the Helpful NPCs crew are happy to give moral instruction in how to DM alignment properly. (Remember, Real D&D has paladins that are Always Lawful Good!)
As promised, here's the clip of Harley Quinn going shopping.