There is considerable debate about whether we can ever experience an emotion without being aware of it (Winkielman & Berridge, 2004), but I would like to suggest that people are never aware of experiencing hubristic pride. What we experience at the time is confidence. Some 15 years ago, I walked into my dissertation defense confident that people can feel happy and sad at the same time and armed with evidence from several studies. This was noteworthy because such philosophers as Socrates (Plato, 1975) and Hume (1739/2000) had speculated about mixed emotions and early psychologists had debated about mixed emotions (e.g., Ebbinghaus, 1902, cited in Wolgemuth, 1919; Wundt, 1896). Moreover, contemporary models of the structure of affect make competing predictions about mixed emotions. Although the committee members Barbara Mellers, Richard Petty, and Philip Tetlock found the studies informative, they also came up with several alternative interpretations for the findings that had not occurred to me. It became clear that what I had taken for confidence had actually been hubris. In the years since, further evidence that people can feel happy and sad at the same time has accumulated as my colleagues, students, and I and other researchers (e.g., Schimmack, 2001) have addressed most of the alternative interpretations that came up. Larsen and McGraw (2014) reviewed this evidence in order to make the case for mixed emotions of happiness and sadness, but here I hope to cross the aisle in order to challenge the existing evidence and speculate about how to provide stronger tests in future research. The Competing Hypotheses The debate is one about the structure of core affect, which Russell and Barrett (1999) defined as the most elementary consciously accessible feelings that people can experience. According to Russell and Barrett's circumplex model, core affect can be described in terms of two psychologically irreducible dimensions. One of these dimensions is the bipolar valence dimension, which ranges from unpleasant states (e.g., sadness) through the neutral point (i.e., no valence) to pleasant states (e.g., happiness). If valence is irreducible (see Barrett & Bliss-Moreau, 2009), happiness and sadness should be mutually exclusive (Russell & Carroll, 1999). In contrast to this bipolarity hypothesis, the evaluative space model (Cacioppo & Berntson, 1994) contends that the positive and negative affective substrates underlying the bipolar valence dimension are separable, which gives rise to the bivariate hypothesis, which holds that happiness and sadness can co-occur. Note that the bipolarity hypothesis does not state that all opposite-valence emotions are mutually exclusive. Watson and Tellegen (1985) highlighted the roles of arousal in emotional experience in a model that is similar to the circumplex model in