The Altruism Bluff
Whether you like it or not, there will come a time in your life when you and someone else will be deadlocked glazing at the last remaining piece of delicious apple pie. A true altruistic being would value the desire of the other person higher than his own and therefore would never order up that ultimate slice. And in comes the sneaky bastard with its sneaky-bastardy-ism (I need to put in a serious effort to make this a common term) ways.