Honorable Challenge

You only cross arms with foes who willingly engage you.
Prerequisite: Lawful alignment.
Effect: You suffer a -4 penalty on attack rolls against creatures that have not explicitly challenged you or made an attack against you. For the purposes of this feat, an attack against you includes any action that would end an invisibility spell (see page 245 of the Player's Handbook).
Suggested Class/Race: Paladins
Source:Dragon Magazine #324 (Class Acts - Flaws For Paladins)