[@Ghost Queen] I'm not concerned about godmodding and overpowered abilities. ;)  Everything -- down to the most minor detail -- has to fit with the overall consistency of the world, the physics, the magic system, and the plot. If a character suddenly throws in an unexpected reveal (they have a minor clairvoyant ability, or they're haunted by a dead relative, or their family was killed by wizards) I have to scramble to change the magic system, the plot, and the physics in order to accommodate that and make it make sense alongside everything else. Most of the time the player is just honestly trying to make the game more awesome, but it causes me unnecessary stress when I wasn't expecting it.

Please don't surprise the GM! The game will be 100% more fun for everyone (including me!) if everyone freely uses my PM box. ;)