I just found something funny about PoM...
Just go anywhere, make sure you're not in a group (dunno if it "works" when in a group or raid) and cast a PoM on yourself... There should be a background sound just where you are. That sound is not linked with you, so when you go away, the sound stay where it was. Other people hear the sound as well.
Try it... and spam it in the shattrat bank ;D