Howard's mom passes out after learning about Howard and Bernadette's engagement. Howard thinks the link between the two events is causal but it turns out to just be a correlation.
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Amy makes fun of Sheldon because he is a theoretical physicist and not an experimental one. She jokes about confounding variables.
Sheldon was told by the university that he needs to take a sexual harassment seminar online.
Raj explains to the girls that if he continues to feed his dog foie gras she is going to die.
The guys discuss the choice between downloading comic books online v coming into the store.