Hmm, the closest I can think of is a racial trait from the "Creating New Races" rules:
Light and Dark (1 RP)
Prerequisites: None.
Benefit: Members of this race gain the following supernatural ability: Once per day as an immediate action, a member of this race can treat positive and negative energies as if it were an undead creature, taking damage from positive energy and healing damage from negative energy. This ability lasts for 1 minute once activated.
It would make a cool feat, though.
Man, I know that feeling! Glad we found it. ^__^
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Well, there is Necromantic Affinity, but that's not a "Once per day" effect, it's always on.
Necromantic Affinity
Long exposure to necromantic energies has granted you a small measure of resistance against them.Prerequisites: Con 15.
Benefit: You gain a +2 bonus on saving throws made to resist spells and effects that utilize negative energy, cause negative levels, or cause ability damage, ability drain, or ability penalties. In addition, damage caused by inflict spells heals you as if you were an undead creature, but you also take damage from cure spells.
Found in the Inner Sea World Guide.
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Actually, there's also Necromantic Affinity which does exactly what you're thinking of, more or less.
EDIT: Ninja'd! At least I linked it...