Ever wonder how we recover from emotional setbacks? How come we can get over the break up, firing, spilt milk so (relatively) easy? We have what Gilbert et al have dubbed a psychological immune system which helps us bounce back from the downs in life. They performed an experiment in which subjects did a mock interview and were rejected for a job. Subjects knew that the interview was fake and that there was no job to get, and when being turned down they either faced one interviewer or three. Those that faced three were more saddened by the event but still recovered fairly quickly. People generally know when something will make them feel bad and they recover much quicker than they expect.
"The pleasure principle does not abandon the intention of ultimately obtaining pleasure, but it nevertheless demands and carries into effect the postponement of satisfaction, the abandonment of a number of possibilities of gaining satisfaction and the temporary toleration of unpleasure as a step on the long indirect road to pleasure" Sigmund Freud
"The consequences of an act affect the probability of it's occurring again" BF Skinner