Changelings have the Racial Emulation feat to let them count as other races for qualifying for things. Goliaths and Half-Giants have Powerful Build to let them count as Large in several circumstances. Many classes and races let you ignore some requirements for certain feats/classes. And lots of characters can use UMD to count as something they're not for using, well, a magic device.
Is there a way to count as Evil in alignment for the purposes of qualifying for feats?