The Parks Department is trying to determine where to eat and Donna suggests sushi. Andy initially declines because he claims that he is allergic, but it turns out he just thinks he’s allergic. Every time he eats 80 pieces of sushi he gets sick. He probably isn’t allergic, but instead is experiencing decreasing returns (negative marginal returns).
See more: decreasing utility, diminishing returns, negative utility, utility
Economics of Parks & Recreation 