Before slaughtering intermixed hordes of NPCs, some of whom are evil and worth experience points, and some of whom are innocent and count as a penalty against experience points, it's vitally important to determine the precise ratios of numbers and relative values.

Transcript

{Shot of cockpit}
Ric Olié: There's Tatooine.
Qui-Gon: Where? Oh, I see.
GM: You see a settlement on your scanners.
Qui-Gon: We should do a bombing run first to soften them up.
Ric Olié: The ship has no weapons.
Qui-Gon: Good point. We'll do it afterwards.
Obi-Wan: Why exactly are we bombing a random town?
Qui-Gon: It's full of evil gangsters, right? That's worth XP.
GM: The innocent civilians are negative XP.
Qui-Gon: Hmm. In that case we'll land outside the town.
{Shot of the ship landing}
GM: The ship touches down on a flat, parched plain, bare of vegetation.
Qui-Gon: On a completely unrelated note, do I have Detect Evil in my spell list?