Creating new NPCs? The story? Making fantastic environments with which to kill your players?

I get geeky warm fuzzies when I generate treasure. I don't know why.

Villains (including mechanical crafting of a finely honed adversary) and ruses/betrayals/surprises.

:evillaugh:  Muahahahaha!

Making a graph paper masterpiece.

I'm with Slaad.  I love setting up a situation that lets the PCs slowly figure out who to trust and who to fear just before I knock over that whole house of cards with a well placed assasination, invasion, arson, cow-tipping...

Even in my IH game, I made sure the PCs had a view of the Big Bad that made him seem like a big meanie.  Then I made sure they saw that his mercenary army was the only thing imposing order on the continent.

For my next game, WFRP, I'm going to introduce the PCs into a spider's web of crime bosses, minor royalty, cops, trade houses and cults.  The most dangerous villain in the game will likely be the one the PCs go to for help.  The one character who can be trusted is the most likely to end up dead at their hands.  If the PCs want to resolve the main plot, they'll have to find a way to unite as many of the powermongers as possible.

Anticipation. I don't write an adventure exactly for the players, as this often looks quite artificial, but sometimes you'll just see your friends before you how they'd react to that certain situation/trap/NPC you're currently crafting. And getting disappointed is as good as being right...

When my players, after finishing it, say, "Wow, that rocked."

The fact that I didn't create it alone - that all my players created it by their actions.

-clash

I like creating "situations" for the pcs to react to.

Regards,
David R

Developing plot-lines and new developments based on the PCs' past actions.  (Disturbing surprises are de rigueur.)

My favorite thing is creating strange and mysterious places for the players to explore.

Quote from: Abyssal MawMy favorite thing is creating strange and mysterious places for the players to explore.

You'd think we could get through one thread without mentioning Abyssal Maw's arse... but no

Can't help it if I'm sexy.

Love to calculate GDPs and set up the military forces and space navies. Also love to calculate manorial income and number of mounted knights per kingdom.