The Big Bang Theory Season 1 Episode 4 : The Luminous Fish Effect
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Sheldon is fired from his job as a physicist at the university when he insults his new boss Dr. Eric Gablehauser (Mark Harelik). His change of circumstance sends him into a downward spiral of depression which results in working on developing luminous fish for nightlights and buying a loom. Leonard tries to cure him by sending for Sheldon's mom, Mary Cooper (Laurie Metcalf). When she arrives for a visit, the men realize she is completely the oppos...