These liaisons are described as highly superficial and based on unrealistic idealized expectations. For example, projects may fail due to unrealistic expectations. Pressuring oneself to achieve unrealistic goals inevitably sets the person up for disappointment. "Cream Lemon" often focuses on unrealistic and exaggerated sexual themes. The nirvana fallacy is the informal fallacy of comparing actual things with unrealistic, idealized alternatives. This makes the IEA scenario technically and financially unrealistic. The series also drew criticism for its unconvincing plot and unrealistic storyline. Criticism has been directed at the character designs, which some have perceived as unrealistic. Many viewers find the hairstyle grotesquely unrealistic. Limbaugh later discouraged efforts to impeach Barack Obama as politically unrealistic. Both sides began negotiations with unrealistic demands. But that soon proved unwieldy, unprofitable, and unrealistic. This is due to the pressure ratio limit that is economically unrealistic to exceed. Martine criticizes his pulp novel work as being unrealistic and corny. More recent scholarship regards these estimates as unrealistic.