In the second episode of the series, professor Legasov is at a local bar drinking and the bartender unscrews the cap on a bottle of vodka and takes a upturned glass from the bar. Legasov points to one of the glasses that are FACE DOWN on the bar. A couple (possibly a husband and wife) noticed this and the wife asks if he is superstitious.
In the podcast it is said that he asks for the upside down glass because it wasn't contaminated with nuclear materials, but since the wife doesn't know that why is she concluding that he is superstitious, does a particular position of a glass has something to do with superstitions?