Searching

For Min-Maxers, it's sometimes difficult, if not impossible, to not make a roll.  This is by design, but can sometimes come back and bite them in the ass.

Suck

There's always a player who writes up a detailed equipment list that usually contains several items or devices that the GM wouldn't think could ever be used within a campaign, and inevitably the player comes up with some twisted, yet plausible, way to use it during the campaign. On another note, it's been almost three …

Second Guessing

As a GM, it's never a good idea to leave your players alone for any length of time and have them continue player interaction.  You might wind up coming back to a game of Call of Cthulu.