The gang faces their mortality when Pierce's mother dies and Jeff learns he has high cholesterol in the  The Psychology of Letting Go  episode of COMMUNITY. Meanwhile, Britta and Annie face off and Abed is in his own world for the episode. It's more

As Annie and Britta attempt to raise money for the oil spill, Jeff has just come from giving blood. As he puts it, even a Ferrari needs a tune-up. But all of this is over-shadowed by Troy seeing a dead body - Pierce's mother. Fortunately (right?), Pi more